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Sun Jan 28, 2007 11:57 am  |
Marina, I copied this out of another post. The post was by Tangal. Hopefully, it will be helpful.
The pH Scale
The pH scale goes from 0-14, this covers most wet substances, though some substances can be extreamly acid or base, and go beyond this scale. But for skincare products, you will not be using these.
-Acids have pH values under 7 - they are more acidic then water (acid)
-alkalis have pH values over 7 - they are more alkaline then water (base)
-If a substance has a pH value of 7 - it is neutral, like water, (neither acid nor base)
The difference between one pH, is one unit of measure, and represents tenfold, or ten times the change.
Each whole number below 7 is ten times more acidic then the next higher number. (6.0 to 7.0 for example) Each whole number above is ten times more alkaline.
The segments between each whole value are divided into increments of 10ths. Not increments of one. Similar to the way a ruler has both inches, and 16ths of inches divisions between each inch marker ( 5.0, 5.1, 5.2, 5.3 …)
For example, a cleanser with a pH of 6 is ten times more alkaline than a cleanser with a pH of 5.
A cleanser with a pH of 7 is 100 times more alkaline then one of 5.
Skin pH is 4.5 to 5.5, which is a recommended cleanser range, for best skin health.
Because of this, only a few units of pH can make a big difference in how a product or your skin reacts.
(A pH scale tells you if a product is more acid or alkaline/base. 7 is neutral - it is equally acid and base. Any number less then 7 is acidic, any number higher then 7 is alkaline)
pH Examples
Some pH examples:
pH 1 battery acid - (acid extreme)
pH 1.5 -2 = Gastric (stomach) acid
pH 2.5 = Cola soft drinks
pH 2 = lemon juice
pH 3 = vinegar
ph = 3.5 Orange Juice
pH 4.6-5.5 = healthy skin
pH 5.5 = rain, (pure water, when exposed to the atmosphere, will take in carbon dioxide, changing its pH)
pH 6.5 = milk
pH 6.5 – 7.4 = Healthy Saliva
pH 7 = pure distilled water - (this is Neutral pH, neither acid or base)[/color]
pH 7.35 – 7.45 = human blood
pH 8.5 = baking soda
pH 9 = Sea Water
pH 9.0-10.0 = Hand Soap, detergents
pH 10.5 = Milk of Magnesia
pH 11.5 = household ammonia
pH 12.5 = household bleach
pH 13 = lye (sodium hydroxide, or Draino)(Alkaline or Base extreme) |
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53 and starting to show it |
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Mon Jan 29, 2007 6:23 am |
Hello, I am new to EDS and this is my very first post.
The following is my recipe for C&E Ferulic, which I first posted on the SAS forum. Hope it is helpful, but you will need a digital scale, which is not at all expensive if you get it off Ebay like I did.
I have not included a preservative in it - because it was so cheap to make, I kept it in the fridge, and used the lot within 10 days on my face, neck, decolletage and forearms (basically slapped it on very liberally after my morning shower, before sealing it in with body lotion).
You will need a digital scale for the level of precision I am prescribing below:
Aloe vera juice 25% 12.5g
Seakelp 25% 12.5g
Distilled water 30% 15.0g
Ascorbic Acid 15% 7.5g
Glycerin 3% 1.5g
Vitamin E 1% 0.5g
Ferulic acid 0.5% 0.25g
Polysorbate 20 0.5% 0.25g
Phase A: Dissolve L-Ascorbic Acid in distilled water via agitation and gentle heating (warm, never hot or you will denature the ascorbic acid).
Phase B: Dissolve the ferulic acid in the glycerin - some "spirited" stirring may be necessary. (Besides being quite an effective solvent, glycerin is also a humectant).
Phase C: Mix together Phase A, Phase B, aloe vera juice, seakelp, Vit.E and Polysorbate 20 (PS20 is necessary to emulsify the anti-ox booster) and stir/agitate until homogenized. |
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| Thu Sep 25, 2025 1:57 pm |
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