[et_pb_section fb_built=“1″ admin_label=“section“ _builder_version=“4.16″ global_colors_info=“{}“ theme_builder_area=“post_content“][et_pb_row admin_label=“row“ _builder_version=“4.16″ background_size=“initial“ background_position=“top_left“ background_repeat=“repeat“ global_colors_info=“{}“ theme_builder_area=“post_content“][et_pb_column type=“4_4″ _builder_version=“4.16″ custom_padding=“|||“ global_colors_info=“{}“ custom_padding__hover=“|||“ theme_builder_area=“post_content“][et_pb_text _builder_version=“4.23″ _module_preset=“default“ theme_builder_area=“post_content“ hover_enabled=“0″ sticky_enabled=“0″]<\/p>\n
Na lahvi\u010dce ho v\u011bt\u0161inou nenajdete, p\u0159esto m\u016f\u017ee ovlivnit, jak se bude v\u00fdrobek na poko\u017ece chovat, zda ji nebude zbyte\u010dn\u011b dr\u00e1\u017edit a jestli budou spr\u00e1vn\u011b fungovat n\u011bkter\u00e9 aktivn\u00ed l\u00e1tky nebo konzervanty.<\/p>\n
U hotov\u00e9 kosmetiky to za n\u00e1s \u0159e\u0161\u00ed v\u00fdrobce. Kdy\u017e ale doma vyr\u00e1b\u00edme vlastn\u00ed tonikum, s\u00e9rum nebo kr\u00e9m, pH u\u017e nen\u00ed jen \u00fadaj z hodiny chemie. Je to sou\u010d\u00e1st receptury. <\/p>\n
[\/et_pb_text][et_pb_image src=“https:\/\/green-gate.eu\/wp-content\/uploads\/2026\/07\/articlePh.png“ _builder_version=“4.23″ _module_preset=“32fecfd5-025d-42fc-9828-d86bb0da2821″ theme_builder_area=“post_content“ hover_enabled=“0″ sticky_enabled=“0″][\/et_pb_image][et_pb_text _builder_version=“4.23″ _module_preset=“71bce9ad-9a5c-4bc0-a49d-5ef17a0a743b“ theme_builder_area=“post_content“ hover_enabled=“0″ sticky_enabled=“0″]<\/p>\n
Zdroj: GreenScan<\/p>\n
[\/et_pb_text][et_pb_text _builder_version=“4.23″ _module_preset=“default“ theme_builder_area=“post_content“ hover_enabled=“0″ sticky_enabled=“0″]<\/p>\n
Hodnota pH n\u00e1m zjednodu\u0161en\u011b \u0159\u00edk\u00e1, jestli je vodn\u00fd roztok kysel\u00fd, neutr\u00e1ln\u00ed, nebo z\u00e1sadit\u00fd.<\/p>\n
Hodnoty pod 7 ozna\u010dujeme jako kysel\u00e9, pH 7 jako neutr\u00e1ln\u00ed a hodnoty nad 7 jako z\u00e1sadit\u00e9. Stupnice je logaritmick\u00e1, tak\u017ee rozd\u00edl mezi pH 5 a pH 6 nen\u00ed tak mal\u00fd, jak m\u016f\u017ee na prvn\u00ed pohled vypadat [1]. <\/p>\n
A pozor na jednu \u010dastou chybu. B\u011b\u017en\u00e9 pH se t\u00fdk\u00e1 p\u0159edev\u0161\u00edm v\u00fdrobk\u016f obsahuj\u00edc\u00edch vodu. pH lze b\u011b\u017en\u011b m\u011b\u0159it jen u v\u00fdrobk\u016f, kter\u00e9 obsahuj\u00ed vodu, proto\u017ee pr\u00e1v\u011b ve vodn\u00e9m prost\u0159ed\u00ed se ur\u010duje kyselost nebo z\u00e1saditost. \u010cist\u00fd olej, m\u00e1slo nebo bezvod\u00fd balz\u00e1m proto nemaj\u00ed pH, kter\u00e9 by \u0161lo zm\u011b\u0159it stejn\u011b jako u tonika \u010di s\u00e9ra. <\/p>\n
[\/et_pb_text][et_pb_image src=“https:\/\/green-gate.eu\/wp-content\/uploads\/2026\/07\/articlePh4-1.png“ _builder_version=“4.23″ _module_preset=“32fecfd5-025d-42fc-9828-d86bb0da2821″ theme_builder_area=“post_content“ hover_enabled=“0″ sticky_enabled=“0″][\/et_pb_image][et_pb_text _builder_version=“4.23″ _module_preset=“71bce9ad-9a5c-4bc0-a49d-5ef17a0a743b“ theme_builder_area=“post_content“ hover_enabled=“0″ sticky_enabled=“0″]<\/p>\n
Zdroj: GreenScan<\/p>\n
[\/et_pb_text][et_pb_text _builder_version=“4.23″ _module_preset=“default“ theme_builder_area=“post_content“ hover_enabled=“0″ sticky_enabled=“0″]<\/p>\n
Povrch zdrav\u00e9 poko\u017eky nen\u00ed neutr\u00e1ln\u00ed. Je p\u0159irozen\u011b m\u00edrn\u011b kysel\u00fd. <\/p>\n
\u010casto se setk\u00e1te s hodnotou pH 5,5, ale nejde o jedno univerz\u00e1ln\u00ed \u010d\u00edslo platn\u00e9 pro ka\u017ed\u00e9ho \u010dlov\u011bka a ka\u017edou \u010d\u00e1st t\u011bla. V\u00fdsledn\u00e9 pH ovliv\u0148uje v\u011bk, m\u00edsto m\u011b\u0159en\u00ed, pot, ko\u017en\u00ed maz, kosmetika, myt\u00ed i okoln\u00ed prost\u0159ed\u00ed. <\/p>\n
V\u00fdzkum uk\u00e1zal, \u017ee p\u0159irozen\u00e9 pH povrchu poko\u017eky je v pr\u016fm\u011bru ni\u017e\u0161\u00ed ne\u017e 5. Takov\u00e9 prost\u0159ed\u00ed bylo spojeno s lep\u0161\u00edmi parametry ko\u017en\u00ed bari\u00e9ry a podm\u00ednkami vhodn\u011bj\u0161\u00edmi pro p\u0159irozenou ko\u017en\u00ed mikrofl\u00f3ru [2]. <\/p>\n
Toto m\u00edrn\u011b kysel\u00e9 prost\u0159ed\u00ed se n\u011bkdy ozna\u010duje jako kysel\u00fd ochrann\u00fd pl\u00e1\u0161\u0165. Pod\u00edl\u00ed se na fungov\u00e1n\u00ed enzym\u016f v nejsvrchn\u011bj\u0161\u00ed vrstv\u011b poko\u017eky, obnov\u011b ko\u017en\u00ed bari\u00e9ry, spr\u00e1vn\u00e9m odlu\u010dov\u00e1n\u00ed odum\u0159el\u00fdch bun\u011bk a ochran\u011b p\u0159ed n\u011bkter\u00fdmi ne\u017e\u00e1douc\u00edmi mikroorganismy [3]. <\/p>\n
To ale neznamen\u00e1, \u017ee kysel\u00e1 poko\u017eka zlividuje bakterie jako ocet vodn\u00ed k\u00e1men. Jde o jemn\u011b nastaven\u00e9 prost\u0159ed\u00ed, ve kter\u00e9m m\u016f\u017ee poko\u017eka spr\u00e1vn\u011b fungovat. <\/p>\n
Mo\u017en\u00e1 \u010dek\u00e1te, \u017ee nejv\u011bt\u0161\u00ed probl\u00e9m p\u0159edstavuje agresivn\u00ed m\u00fddlo. Jen\u017ee pH poko\u017eky m\u016f\u017ee do\u010dasn\u011b zv\u00fd\u0161it i samotn\u00e9 opl\u00e1chnut\u00ed vodou. <\/p>\n
Studie ukazuj\u00ed, \u017ee po myt\u00ed m\u016f\u017ee n\u00e1vrat poko\u017eky k p\u016fvodn\u00edmu pH trvat n\u011bkolik hodin [2, 4]. To samoz\u0159ejm\u011b neznamen\u00e1, \u017ee bychom se m\u011bli p\u0159estat m\u00fdt. Poko\u017eka m\u00e1 schopnost sv\u00e9 prost\u0159ed\u00ed znovu upravit. <\/p>\n
Probl\u00e9m m\u016f\u017ee nastat sp\u00ed\u0161e p\u0159i \u010dast\u00e9m myt\u00ed, pou\u017e\u00edv\u00e1n\u00ed siln\u011b z\u00e1sadit\u00fdch v\u00fdrobk\u016f nebo nevhodn\u00fdch \u010distic\u00edch l\u00e1tek. Zvl\u00e1\u0161\u0165 pokud u\u017e je poko\u017eka such\u00e1, citliv\u00e1 nebo m\u00e1 naru\u0161enou bari\u00e9ru.<\/p>\n
A d\u016fle\u017eit\u00fd detail. Jemnost \u010distic\u00edho v\u00fdrobku neur\u010duje jen pH. Z\u00e1le\u017e\u00ed tak\u00e9 na druhu a mno\u017estv\u00ed tenzid\u016f, tedy myc\u00edch l\u00e1tek, d\u00e9lce kontaktu s poko\u017ekou, teplot\u011b vody a \u010detnosti pou\u017e\u00edv\u00e1n\u00ed. I dva v\u00fdrobky se stejn\u00fdm pH se proto mohou na poko\u017ece chovat \u00fapln\u011b jinak [4, 5]. <\/p>\n
N\u00e1pis \u201epH 5,5\u201c m\u016f\u017ee zn\u00edt odborn\u011b a d\u016fv\u011bryhodn\u011b. Neznamen\u00e1 ale automaticky, \u017ee je produkt kvalitn\u00ed, jemn\u00fd nebo vhodn\u00fd pr\u00e1v\u011b pro va\u0161i poko\u017eku. <\/p>\n
Kosmetick\u00fd v\u00fdrobek je cel\u00e1 sm\u011bs. Z\u00e1le\u017e\u00ed na pou\u017eit\u00fdch l\u00e1tk\u00e1ch, jejich koncentraci, kombinaci, konzervaci, stabilit\u011b i zp\u016fsobu pou\u017eit\u00ed. <\/p>\n
Stejn\u011b tak neplat\u00ed, \u017ee ka\u017ed\u00fd kr\u00e9m, tonikum nebo s\u00e9rum mus\u00ed m\u00edt pH p\u0159esn\u011b 5,5. Vhodn\u00e1 hodnota se odv\u00edj\u00ed od \u00fa\u010delu v\u00fdrobku a jeho slo\u017een\u00ed. <\/p>\n
V\u00fdrobky ur\u010den\u00e9 pro b\u011b\u017enou ka\u017edodenn\u00ed p\u00e9\u010di b\u00fdvaj\u00ed \u010dasto m\u00edrn\u011b kysel\u00e9 a jejich pH se m\u016f\u017ee pohybovat p\u0159ibli\u017en\u011b v oblasti pH poko\u017eky.<\/p>\n
To ale neznamen\u00e1, \u017ee tonikum s pH 5,2 je automaticky skv\u011bl\u00e9 a tonikum s pH 6 \u0161patn\u00e9. pH je jen jedna \u010d\u00e1st cel\u00e9 skl\u00e1da\u010dky. <\/p>\n
Tonikum nav\u00edc nemus\u00ed \u201eobnovovat pH\u201c po ka\u017ed\u00e9m \u010di\u0161t\u011bn\u00ed. Modern\u00ed jemn\u00e9 \u010distic\u00ed v\u00fdrobky mohou b\u00fdt samy formulov\u00e1ny jako m\u00edrn\u011b kysel\u00e9. Hlavn\u00ed funkc\u00ed tonika m\u016f\u017ee b\u00fdt nap\u0159\u00edklad hydratace nebo dod\u00e1n\u00ed konkr\u00e9tn\u00edch aktivn\u00edch l\u00e1tek. <\/p>\n
U exfolia\u010dn\u00edch v\u00fdrobk\u016f s AHA kyselinami z\u00e1le\u017e\u00ed na pH opravdu hodn\u011b. Po\u0159\u00e1d ale nesta\u010d\u00ed zn\u00e1t jen jedno \u010d\u00edslo.<\/p>\n
\u00da\u010dinek a riziko podr\u00e1\u017ed\u011bn\u00ed ovliv\u0148uje druh kyseliny, jej\u00ed koncentrace, v\u00fdsledn\u00e9 pH, mno\u017estv\u00ed voln\u00e9 kyseliny, d\u00e9lka p\u016fsoben\u00ed i stav poko\u017eky. S ni\u017e\u0161\u00edm pH m\u016f\u017ee b\u00fdt v\u011bt\u0161\u00ed \u010d\u00e1st kyseliny v aktivn\u00ed form\u011b, z\u00e1rove\u0148 ale m\u016f\u017ee r\u016fst riziko \u0161t\u00edp\u00e1n\u00ed, podr\u00e1\u017ed\u011bn\u00ed nebo po\u0161kozen\u00ed poko\u017eky. <\/p>\n
U kosmetick\u00fdch v\u00fdrobk\u016f s AHA kyselinami pro dom\u00e1c\u00ed pou\u017eit\u00ed se v odborn\u00e9 literatu\u0159e \u010dasto uv\u00e1d\u00ed maxim\u00e1ln\u00ed koncentrace 10 % a v\u00fdsledn\u00e9 pH alespo\u0148 3,5 [6]. Nejde ale o n\u00e1vod, \u017ee doma sta\u010d\u00ed nam\u00edchat desetiprocentn\u00ed kyselinu a upravit pH na 3,5. Bezpe\u010dnost z\u00e1vis\u00ed na cel\u00e9 receptu\u0159e. <\/p>\n
Siln\u00e9 dom\u00e1c\u00ed kyselinov\u00e9 peelingy proto nejsou dobr\u00fd DIY experiment.<\/p>\n
[\/et_pb_text][et_pb_image src=“https:\/\/green-gate.eu\/wp-content\/uploads\/2026\/07\/articlePh2.png“ _builder_version=“4.23″ _module_preset=“32fecfd5-025d-42fc-9828-d86bb0da2821″ theme_builder_area=“post_content“ hover_enabled=“0″ sticky_enabled=“0″][\/et_pb_image][et_pb_text _builder_version=“4.23″ _module_preset=“71bce9ad-9a5c-4bc0-a49d-5ef17a0a743b“ theme_builder_area=“post_content“ hover_enabled=“0″ sticky_enabled=“0″]<\/p>\n
Zdroj: GreenScan<\/p>\n
[\/et_pb_text][et_pb_text _builder_version=“4.23″ _module_preset=“default“ theme_builder_area=“post_content“ hover_enabled=“0″ sticky_enabled=“0″]<\/p>\n
Ani u vitaminu C nesta\u010d\u00ed p\u0159e\u010d\u00edst n\u00e1pis na p\u0159edn\u00ed stran\u011b obalu. Existuje n\u011bkolik r\u016fzn\u00fdch forem vitaminu C a ka\u017ed\u00e1 se m\u016f\u017ee chovat jinak. <\/p>\n
U \u010dist\u00e9 kyseliny L-askorbov\u00e9 v\u00fdzkum uk\u00e1zal, \u017ee pro jej\u00ed pronik\u00e1n\u00ed do poko\u017eky bylo pot\u0159eba pH ni\u017e\u0161\u00ed ne\u017e 3,5 [7]. Takto kysel\u00fd v\u00fdrobek ale m\u016f\u017ee citlivou poko\u017eku dr\u00e1\u017edit. <\/p>\n
Deriv\u00e1ty vitaminu C mohou b\u00fdt stabiln\u00ed a pou\u017eiteln\u00e9 p\u0159i jin\u00fdch hodnot\u00e1ch pH. Proto neplat\u00ed, \u017ee ka\u017ed\u00e9 s\u00e9rum s vitaminem C mus\u00ed m\u00edt pH 3. <\/p>\n
U retinolu se n\u011bkdy uv\u00e1d\u00ed jednoduch\u00e9 pravidlo, \u017ee m\u00e1 m\u00edt v\u00fdrobek pH p\u0159ibli\u017en\u011b 5 a\u017e 6. Ve skute\u010dnosti ale stabilitu retinoid\u016f neovliv\u0148uje pouze pH. <\/p>\n
D\u016fle\u017eit\u00e1 je konkr\u00e9tn\u00ed forma retinoidu, slo\u017een\u00ed v\u00fdrobku, sv\u011btlo, kysl\u00edk, teplota, obal i doba skladov\u00e1n\u00ed. Studie komer\u010dn\u00edch v\u00fdrobk\u016f uk\u00e1zala v\u00fdrazn\u00e9 rozd\u00edly ve stabilit\u011b retinoid\u016f podle konkr\u00e9tn\u00ed receptury [8]. <\/p>\n
Zm\u011b\u0159it kr\u00e9mu pH tedy nesta\u010d\u00ed k tomu, abychom zjistili, jestli v n\u011bm retinol z\u016fstane stabiln\u00ed a \u00fa\u010dinn\u00fd.<\/p>\n
Na internetu m\u016f\u017eete naj\u00edt n\u00e1vody, podle kter\u00fdch je nutn\u00e9 nan\u00e1\u0161et produkty od nejni\u017e\u0161\u00edho pH po nejvy\u0161\u0161\u00ed a mezi jednotliv\u00fdmi vrstvami \u010dekat t\u0159eba dvacet minut.<\/p>\n
Pro b\u011b\u017enou p\u00e9\u010di o ple\u0165 to v\u011bt\u0161inou nen\u00ed pot\u0159eba.<\/p>\n
Hotov\u00e9 kosmetick\u00e9 v\u00fdrobky by m\u011bly b\u00fdt navr\u017eeny tak, aby fungovaly p\u0159i doporu\u010den\u00e9m pou\u017eit\u00ed. Mnohem d\u016fle\u017eit\u011bj\u0161\u00ed je nep\u0159et\u00ed\u017eit ple\u0165 n\u011bkolika dr\u00e1\u017ediv\u00fdmi aktivn\u00edmi l\u00e1tkami najednou. <\/p>\n
Jednoduch\u00e9 po\u0159ad\u00ed obvykle sta\u010d\u00ed:<\/strong><\/p>\n U kyselin, retinoid\u016f nebo dal\u0161\u00edch intenzivn\u00edch aktivn\u00edch l\u00e1tek sledujte p\u0159edev\u0161\u00edm doporu\u010den\u00ed v\u00fdrobce a reakci sv\u00e9 poko\u017eky. V\u00edce aktivn\u00edch l\u00e1tek neznamen\u00e1 automaticky lep\u0161\u00ed v\u00fdsledek. <\/p>\n P\u0159i dom\u00e1c\u00ed v\u00fdrob\u011b m\u016f\u017ee pH ovlivnit nejen to, jestli bude v\u00fdrobek p\u0159\u00edjemn\u00fd na poko\u017ece.<\/p>\n M\u016f\u017ee ovlivnit tak\u00e9:<\/strong><\/p>\n [\/et_pb_text][et_pb_image src=“https:\/\/green-gate.eu\/wp-content\/uploads\/2026\/07\/articlePh3.png“ _builder_version=“4.23″ _module_preset=“32fecfd5-025d-42fc-9828-d86bb0da2821″ theme_builder_area=“post_content“ hover_enabled=“0″ sticky_enabled=“0″][\/et_pb_image][et_pb_text _builder_version=“4.23″ _module_preset=“71bce9ad-9a5c-4bc0-a49d-5ef17a0a743b“ theme_builder_area=“post_content“ hover_enabled=“0″ sticky_enabled=“0″]<\/p>\n Zdroj: GreenScan<\/p>\n [\/et_pb_text][et_pb_text _builder_version=“4.23″ _module_preset=“default“ theme_builder_area=“post_content“ hover_enabled=“0″ sticky_enabled=“0″]<\/p>\n pH se proto m\u011b\u0159\u00ed a\u017e u hotov\u00e9ho, d\u016fkladn\u011b prom\u00edchan\u00e9ho v\u00fdrobku. U n\u011bkter\u00fdch receptur je vhodn\u00e9 m\u011b\u0159en\u00ed po \u010dase zopakovat, proto\u017ee se hodnota m\u016f\u017ee b\u011bhem skladov\u00e1n\u00ed m\u011bnit. <\/p>\n Indik\u00e1torov\u00e9 pap\u00edrky jsou vhodn\u00e9 pro z\u00e1kladn\u00ed orientaci. U barevn\u00fdch, hust\u00fdch nebo zakalen\u00fdch v\u00fdrobk\u016f se ale m\u016f\u017ee v\u00fdsledek \u0161patn\u011b ode\u010d\u00edtat. <\/p>\n P\u0159esn\u011bj\u0161\u00ed je spr\u00e1vn\u011b kalibrovan\u00fd pH metr s elektrodou vhodnou pro dan\u00fd typ vzorku. Ani drah\u00fd pH metr ale nepom\u016f\u017ee, pokud nen\u00ed kalibrovan\u00fd nebo pokud m\u011b\u0159\u00edte nespr\u00e1vn\u00fdm zp\u016fsobem. <\/p>\n pH nen\u00ed \u010d\u00edslo, kter\u00e9 sta\u010d\u00ed jednou zm\u011b\u0159it a od\u0161krtnout.<\/p>\n [\/et_pb_text][et_pb_image src=“https:\/\/green-gate.eu\/wp-content\/uploads\/2026\/07\/ph_cover.png“ _builder_version=“4.23″ _module_preset=“32fecfd5-025d-42fc-9828-d86bb0da2821″ theme_builder_area=“post_content“ hover_enabled=“0″ sticky_enabled=“0″][\/et_pb_image][et_pb_text _builder_version=“4.23″ _module_preset=“71bce9ad-9a5c-4bc0-a49d-5ef17a0a743b“ theme_builder_area=“post_content“ hover_enabled=“0″ sticky_enabled=“0″]<\/p>\n Zdroj: GreenScan<\/p>\n [\/et_pb_text][et_pb_text _builder_version=“4.23″ _module_preset=“default“ theme_builder_area=“post_content“ hover_enabled=“0″ sticky_enabled=“0″]<\/p>\n Tohle je u DIY kosmetiky opravdu d\u016fle\u017eit\u00e9.<\/p>\n Pokud v\u00fdrobek obsahuje vodu, hydrol\u00e1t, bylinn\u00fd v\u00fdluh nebo jinou vodnou slo\u017eku, mohou se v n\u011bm mno\u017eit bakterie, kvasinky nebo pl\u00edsn\u011b.<\/p>\n To, \u017ee m\u00e1 tonikum pH 5, neznamen\u00e1, \u017ee je automaticky mikrobiologicky bezpe\u010dn\u00e9. Mnoh\u00e9 mikroorganismy dok\u00e1\u017eou r\u016fst pr\u00e1v\u011b v rozmez\u00ed pH b\u011b\u017en\u00e9m u kosmetick\u00fdch v\u00fdrobk\u016f. \u00da\u010dinnost konzervace nav\u00edc z\u00e1vis\u00ed na konkr\u00e9tn\u00edm konzervantu, jeho mno\u017estv\u00ed, pH, obalu a cel\u00e9m slo\u017een\u00ed [9]. <\/p>\n Spr\u00e1vn\u00e9 pH proto nenahrazuje:<\/strong><\/p>\n U komer\u010dn\u00ed kosmetiky se \u00fa\u010dinnost konzerva\u010dn\u00edho syst\u00e9mu ov\u011b\u0159uje tak\u00e9 z\u00e1t\u011b\u017eov\u00fdm testem, p\u0159i kter\u00e9m se sleduje, zda si v\u00fdrobek dok\u00e1\u017ee poradit s p\u0159idan\u00fdmi mikroorganismy [9].<\/p>\n Dom\u00e1c\u00ed tonikum tedy nen\u00ed bezpe\u010dn\u00e9 na n\u011bkolik m\u011bs\u00edc\u016f jen proto, \u017ee hezky von\u00ed, vypad\u00e1 stejn\u011b a stoj\u00ed v lednici. Mikrobi\u00e1ln\u00ed kontaminaci \u010dasto nemus\u00edme poznat pohledem ani \u010dichem. <\/p>\n \u010cist\u011b olejov\u00fd balz\u00e1m nebo sm\u011bs oleje a m\u00e1sla obvykle nepot\u0159ebuj\u00ed m\u011b\u0159it pH. Proto\u017ee neobsahuj\u00ed vodu, maj\u00ed tak\u00e9 v\u00fdrazn\u011b ni\u017e\u0161\u00ed riziko r\u016fstu mikroorganism\u016f ne\u017e vodn\u00e9 v\u00fdrobky. <\/p>\n To ale neznamen\u00e1, \u017ee jsou nesmrteln\u00e9.<\/p>\n Oleje mohou oxidovat a \u017eluknout. A pokud do kel\u00edmku opakovan\u011b sah\u00e1me mokr\u00fdmi prsty nebo se do n\u011bj dostane voda ze sprchy, podm\u00ednky se m\u011bn\u00ed. <\/p>\n Tak\u017ee \u010dist\u00e9 ruce, such\u00e1 l\u017ei\u010dka a \u017e\u00e1dn\u00e1 voda v kel\u00edmku. Ano, i takov\u00e1 drobnost m\u016f\u017ee rozhodovat. <\/p>\n [\/et_pb_text][et_pb_image src=“https:\/\/green-gate.eu\/wp-content\/uploads\/2026\/07\/articlePh5.png“ _builder_version=“4.23″ _module_preset=“32fecfd5-025d-42fc-9828-d86bb0da2821″ theme_builder_area=“post_content“ hover_enabled=“0″ sticky_enabled=“0″][\/et_pb_image][et_pb_text _builder_version=“4.23″ _module_preset=“71bce9ad-9a5c-4bc0-a49d-5ef17a0a743b“ theme_builder_area=“post_content“ hover_enabled=“0″ sticky_enabled=“0″]<\/p>\n Zdroj: GreenScan<\/p>\n [\/et_pb_text][et_pb_text _builder_version=“4.23″ _module_preset=“default“ theme_builder_area=“post_content“ hover_enabled=“0″ sticky_enabled=“0″]<\/p>\n pH se upravuje velmi opatrn\u011b, po mal\u00fdch mno\u017estv\u00edch vhodn\u00e9ho z\u0159ed\u011bn\u00e9ho roztoku kyseliny nebo z\u00e1sady.<\/p>\n Nen\u00ed dobr\u00fd n\u00e1pad nasypat do v\u00fdrobku od oka kyselinu citronovou nebo jedlou sodu. Snadno pH p\u0159est\u0159el\u00edte a potom budete st\u0159\u00eddav\u011b p\u0159id\u00e1vat kyselinu a z\u00e1sadu, dokud recept nebude p\u0159ipom\u00ednat chemick\u00fd gul\u00e1\u0161. <\/p>\n Po ka\u017ed\u00e9m p\u0159id\u00e1n\u00ed je pot\u0159eba v\u00fdrobek d\u016fkladn\u011b prom\u00edchat a znovu zm\u011b\u0159it.<\/p>\n U receptu byste m\u011bli v\u011bd\u011bt:<\/strong><\/p>\n \u017daneta: <\/strong>Kdy\u017e u receptu nen\u00ed uvedeno v\u00fdsledn\u00e9 pH, zp\u016fsob jeho zm\u011b\u0159en\u00ed ani informace o konzervaci, zpozorn\u011bla bych. Zvl\u00e1\u0161\u0165 pokud jde o s\u00e9rum, tonikum nebo kr\u00e9m obsahuj\u00edc\u00ed vodu. \u201eP\u0159\u00edrodn\u00ed\u201c toti\u017e neznamen\u00e1 automaticky bezpe\u010dn\u00e9 a dom\u00e1c\u00ed neznamen\u00e1, \u017ee m\u016f\u017eeme p\u0159esko\u010dit chemii. <\/em><\/p>\n [\/et_pb_text][et_pb_text _builder_version=“4.23″ _module_preset=“ad82dfb1-835c-4330-9bf8-b00b8058f328″ theme_builder_area=“post_content“ hover_enabled=“0″ sticky_enabled=“0″]<\/p>\n GG tip: <\/strong>pH je d\u016fle\u017eit\u00e9, ale samo o sob\u011b nerozhoduje o tom, jestli je kosmetika kvalitn\u00ed a bezpe\u010dn\u00e1.<\/p>\n Produkt s pH 5,5 m\u016f\u017ee obsahovat nevhodn\u011b zvolen\u00e9 tenzidy, dr\u00e1\u017edivou parfemaci nebo nefunk\u010dn\u00ed konzervaci. Jin\u00fd produkt m\u016f\u017ee m\u00edt trochu odli\u0161n\u00e9 pH, ale b\u00fdt dob\u0159e sestaven\u00fd a poko\u017ece vyhovovat. <\/p>\n Ned\u00edvejte se proto jen na jedno \u010d\u00edslo. Sledujte celou recepturu, koncentrace ingredienc\u00ed, zp\u016fsob pou\u017eit\u00ed, obal a pot\u0159eby sv\u00e9 poko\u017eky. <\/p>\n Proto\u017ee stejn\u011b jako u slo\u017een\u00ed nakonec nerozhoduje marketing. Rozhoduje, co ve v\u00fdrobku skute\u010dn\u011b je a jak to cel\u00e9 funguje dohromady. <\/p>\n [\/et_pb_text][et_pb_text _builder_version=“4.23″ _module_preset=“b69f9b3d-c69a-4c5f-a3b8-4a8a74c4c1a0″ theme_builder_area=“post_content“ hover_enabled=“0″ sticky_enabled=“0″]<\/p>\n [1] Buck et al. Measurement of pH. Definition, standards, and procedures. Pure and Applied Chemistry, 2002, 74(11), 2169\u20132200. [2] Lambers et al. Natural skin surface pH is on average below 5, which is beneficial for its resident flora. International Journal of Cosmetic Science, 2006, 28(5), 359\u2013370. [3] Schmid-Wendtner, Korting. The pH of the skin surface and its impact on the barrier function. Skin Pharmacology and Physiology, 2006, 19(6), 296\u2013302. [4] Blaak, Staib. The Relation of pH and Skin Cleansing. Current Problems in Dermatology, 2018, 54, 132\u2013142. [5] Ananthapadmanabhan et al. Cleansing without compromise: the impact of cleansers on the skin barrier and the technology of mild cleansing. Dermatologic Therapy, 2004, 17, 16\u201325. [6] Kornhauser, Coelho, Hearing. Applications of hydroxy acids: classification, mechanisms, and photoactivity. Clinical, Cosmetic and Investigational Dermatology, 2010, 3, 135\u2013142. [7] Pinnell et al. Topical L-ascorbic acid: percutaneous absorption studies. Dermatologic Surgery, 2001, 27(2), 137\u2013142. [8] Temova Raku\u0161a et al. Retinoid stability and degradation kinetics in commercial cosmetic products. Journal of Cosmetic Dermatology, 2021, 20(7), 2350\u20132358. \n
DIY kosmetika: Tady u\u017e je pH opravdu d\u016fle\u017eit\u00e9<\/h4>\n
\n
Pap\u00edrky, nebo pH metr?<\/h4>\n
Spr\u00e1vn\u00e9 pH nen\u00ed konzervant<\/h4>\n
\n
A co bezvod\u00e1 kosmetika?<\/h4>\n
Jak pH dom\u00e1c\u00ed kosmetiky upravit?<\/h4>\n
\n
Zdroje<\/h4>\n
https:\/\/doi.org\/10.1351\/pac200274112169<\/a><\/p>\n
https:\/\/pubmed.ncbi.nlm.nih.gov\/18489300\/<\/a><\/p>\n
https:\/\/pubmed.ncbi.nlm.nih.gov\/16864974\/<\/a><\/p>\n
https:\/\/pubmed.ncbi.nlm.nih.gov\/30130782\/<\/a><\/p>\n
https:\/\/pubmed.ncbi.nlm.nih.gov\/14728695\/<\/a><\/p>\n
https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC3047947\/<\/a><\/p>\n
https:\/\/pubmed.ncbi.nlm.nih.gov\/11207686\/<\/a><\/p>\n
https:\/\/pubmed.ncbi.nlm.nih.gov\/33206444\/<\/a><\/p>\n