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Section No. 8

Vanishing cream is an emulsion primarily made of stearic acid and is used for various purposes such as sunscreen and nourishing cream. The document includes a recipe for making the cream, detailing the required ingredients and their quantities, as well as the procedures for preparation. It also compares vanishing cream with cold cream, highlighting differences in composition, usage, and effects on the skin.

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31 views10 pages

Section No. 8

Vanishing cream is an emulsion primarily made of stearic acid and is used for various purposes such as sunscreen and nourishing cream. The document includes a recipe for making the cream, detailing the required ingredients and their quantities, as well as the procedures for preparation. It also compares vanishing cream with cold cream, highlighting differences in composition, usage, and effects on the skin.

Uploaded by

kekuliblinder
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© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Vanishing cream

II-Vanishing or Day cream:


 A vanishing cream is an emulsion of
stearic acid.
 The emulsifying agent is soap or a
mixture of soaps of sodium, potassium
and ammonia.
 They are called vanishing creams because
they seem to disappear when rubbed into
the skin; also they are called foundation
creams. they can be used for sunscreen,
non foam shaving cream and nourishing
cream.
Rx,

Purified water 79g


Stearic acid 15g
Glycerol 5g
KOH ?g

Make cream, Mitte:10 gm


Sig. M.D.U.
 M.wt. of stearic acid = 284.5
 M.wt of KOH = 56.11
Calculation of the required amount of
KOH:

Since 1 mole of stearic acid = 1 mole of KOH


So 284.5g stearic acid → 56.11 g KOH
15g → ?g
0.25(15) → ?g
X = 0.72 g
N.B. The required amount of KOH is only 25% of the
obtained value.
Rx,
10/100
Purified water 79g
7.9 g
Stearic acid 15g
Glycerol 5g 1.5 g
KOH 0.72g 0.5g
0.072 g
Make cream
send 10 gm
Label: To be used as directed
Procedures:
1- Melt stearic acid on a non- boiling water bath.

2- Dissolve KOH in water then add glycerin,


heat the mixture to 75 - 80°C.

3- Add the aqueous phase to the oily phase gradually with


trituration.

4- Remove from the water bath and triturate until


congealing.

Write Label
Notes:
1- We use 25% of the calculated amount of KOH so as
to avoid froth formation.
2- The cream is non greasy.
3- When applied to the skin water evaporates and the
stearic acid precipitates on the skin which cause
considerable increase in the smoothness of the skin.
4-Alkali used : KOH, Na OH or Triethanolamine,
* (Pot. Stearate> Sod. stearate> Triethanolamine stearate)
In emulsifying power

*(Sod. stearate> Pot. Stearate> Triethanolamine stearate.


In cream hardness
Differences between cold and vanishing
creams
Property Cold cream Vanishing cream

1- ُEmulsion Type
W/O O/W

2- Oil content 45% - 80% 15% - 30%

25% 80%
3- Water content

Na salt produced by Potassium salt produced


4-Surfactant reaction between fatty by reaction between stearic
acid in beeswax and NaOH acid and KOH
in borax.
5- Time of use Night Day

6- Appearance Shinny Not shinny


7- Humectant use No Yes
8- Emollient effect Yes No
9- Cooling effect Yes No
Any
Questions

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