Thames & Kosmos Creative Cosmetics Lab handleiding

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Gelatin has the ability to swell up in

cold water and to be dissolved when

heated. And, as soon as it is cooled off again,

it forms a “reversible” gel. That means

it can return to an earlier state. Parts of

a collagen molecule are responsible for

its firm structure, while other parts bond

with water molecules. In warm water, the

water molecules can slide in between the

collagen molecules and fold their inner

structure together. This is when the gelatin

is dissolved. When cooled off, the collagen

molecules connect themselves together

again and, as a result, form a network that

can make liquids firm.

Collagen

Another natural polymer is collagen.

Collagen functions very differently than

starch. Collagen fibers form bundles that

give cells structure. This is why collagen is

found in tissues such as tendons, ligaments,

and skin. The gelatin used in the shower jelly

is mainly made up of collagen molecules

that have been irreversibly cut.

In young skin, there is a fine

balance between collagen production

and collagen removal. With age, this

balance shifts as more and more

collagen is removed and not replaced.

Thus, the older you get, the drier your

skin becomes. The surface layer gets

thinner and thinner and the re-supply

of new skin cells takes almost twice

as long as in youth, causing wrinkles

to appear and intensify. And on much

older people, dark-colored spots, or

age spots, can occur.

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