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Colorants
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This is a tricky question. The FDA sets guidelines for colors in cosmetics but....soap has an exemption. This means technically you could use anything to color soap. For liability reasons, you may want to comply with the government and only use colorants approved by the FDA for skin contact. Your supplier will be able to tell you if the color you are purchasing is approved by the FDA for skincare products.
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The migration or "bleeding" of color is because you used a cosmetic grade dye. Dyes are great because they produce bright, stained glass clear color. Dyes are water based and so is mp soap...so they will bleed together in layered soap.
If you do not want your colors to migrate or "bleed" you will need to use a cosmetic grade pigment or non migrating mica.
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Pigments are all natural and will not migrate in soap. They tend to be very dull and earth like in color. The red tends to be more of a brick red and the yellow more of a mustard yellow.
Mica can sparkle brilliantly. It can also have a soft frosted appearance. Some micas migrate while others do not.
Dyes are water based colors. They are bright and vibrant. They look much like stained glass on a church window. They will always migrate in mp soap. They are the only color that allows a clear bar of soap to stay clear.
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If your soap bubbles are the color of your soap, you have used too much color. Your soap bubbles should always be white.
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A true red bar of soap can only be made with a clear soap base. If you try to make it with white soap, it will turn pink. It is sort of like mixing white paint and red paint....you will always get pink paint.
If you would like to make a red bar of soap that you cannot see through, color your clear soap red and then add a small piece of white soap. This will cloud the clear base and your soap will stay red.
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