回復 1# lgpen2
說真的我不是讀化學的，剛學做皂也是跟著老師說要4~6週就是那麼久。 也沒想那麼多哪!
你這樣問，也讓我想了解這樣的問題，搜尋中文文章很少有文章提到這個解答。
油有分硬油和軟油
有一個說法是說因每種油的分子不同，不同的油所需的晾皂時間也不同。但我找不到油脂分子不同而影響水分蒸發速度和降鹼速度的論點文章，可是油有分硬油和軟油， 純橄欖皂使用橄欖油是屬軟油，所以固體化的時間比其它混合軟硬油配方的皂時間長。 也就是說要長一點的時間才會達到可用耐用的硬度。
如果你有興趣可看看這本書，這本是以化學背景討論手工皂，資料是經過科學實驗驗證過後的。
作者：Kevin M. Dunn
晾皂是為了要降鹼?
1.上述書本中的第21章中提到，皂糊的含鹼10%時，溫度在160°F（71℃）這溫度接近熱制法，一個小時後鹼量皂化降到0.1%
To make sure that the saponification process is completely complete. This generally takes about 24-48 hours. Yes...I know it sounds like blasphemy...but your soap really IS safe to use after a couple of days.
Now...before you all yell at me...it does become milder as it ages and cures more...but only a TINY TINY bit. 99% of the ph changes happen in the first 48 hours.
晾皂是為了要耐洗: 1.上述書本中提到，就算剛作好皂且降PH到可接受範圍，這時使用皂會很快就融化也不耐用且皂體偏軟。 如果要販賣的皂應該要放到4~6週水份蒸發後，這時稱重後所標示的淨重量才是真實。 放4~6周後皂才是裏外都完全硬化，且ph值降到最低了，這時的皂才是最溫和最佳狀態的手工皂。
2.晾皂最主要的好處是在於讓水份蒸發，幫助皂固體化並增加皂的硬度。你會發現放晾越久的皂越耐洗和也不易融化。 老手是可以從配方中去減少水量以達到縮短晾皂的時間。但減水量有一定的操作難度和危險性所以新手要小心操作。
The real reason to cure your soap is for the water to evaporate. A harder bar of soap will last longer, lather better and just be overall better soap. For this, yes, wait a few weeks.
Now, if you discount your water (use less water than your recipe calls for) you can reduce your cure time. The less water you put IN...the less time you have to wait for the water to evaporate out.
BUT, it really is only safe if you are an EXPERIENCED soap maker though...it is NOT for beginners.
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發表於 2013-1-9 02:52
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發表於 2013-1-9 22:00
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