The distinction depends on the size of the particles and the solubility of the components. Solutions are uniform mixtures of two or more mutually mixable substances. Suspensions are uniform mixtures of two or more substances. Emulsions are of an unstable mixture of two or more immiscible substances united with the aid of the emulsifier.
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Water makes up a large part of the skin. All cells require water to live, and even dying cells in the upper layer of the skin contain water. Water replenishes moisture on the surface of the skin, helps keep other ingredients in solution, and helps spread products across the skin.
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Oxidation chemically changes the iron into iron oxide
Reduction is oxidation and reduction happens at the same time, also called redox reactions.
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It defends cells from radiation, cell death, tissue breakdown, and aging.
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To understand the chemistry of products and to make selections based on the skin type and condition being treated.
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