I have this problem that sometimes i need various polymer clay colors,but i can't afford them all! So i came up with this great solution.
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To start,gather your light colored polymer clay and pastel crayons.For this tutorial,i used oil pastels.
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Oil pastels are more oily than simple pastels.You can buy them in most craft stores.
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Pastels are more dry than oil pastels.When i went to Art school,we were drawing with these on special surfaces. I think you can buy them in art stores. But you can also use pastels to make fimo cakes or other stuff to make them look more realistic.
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To start making your own colored clay,gather some light colored clay and crayon of your choice.
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Scratch some crayon onto polymer clay and mix in.
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This how your clay will look after the crayon is added.
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Make us much colors as you like!