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what's the natural source of food coloring: blue, purple, green, orange

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what's the natural source of food coloring: blue, purple, green, orange

goute | Oct 6, 2010 05:15 AM

I'm following a recipe ( http://www.wikimama.com/recipe/bento ) to dye onrigi (japanese rice ball) with rainbow colors.

Yellow (curry) and red (beet) is easy, but I couldn't find out any information about the natural green, orange, blue and purple sources. Most recipes tell me how to use bottles of artificial food coloring (for baking cupcake) and that's why I actually want to avoid.
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Can you think of any natural source for green, blue, purple, orange?

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