I have read about dying pasta with liquid food coloring. I have powdered for baking, would I be able to use it to dye pasta noodles just the same?!
The method I have seen, you take already cooked pasta and place it in a plastic bag with some water and a few drops of food coloring. Would I be able to achieve the same thing using powdered food coloring?
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Powdered turmeric is also used.
This makes me wonder if dry food coloring could be worked into the the pasta dough before rolling and cutting.
Maybe try a small sample next time you make pasta.
For sure you should dilute the powdered dye with a little water first before tossing it in the ziplock bag. If you sprinkle the powdered dye directly into the bag, there's a very high chance it will distribute very unevenly.
I would expect some of the dye to stain other ingredients that the dyed pasta is combined with afterward since it's a superficial application.
In the same way if you dyed boiled white-fleshed potatoes with turmeric and then made a salad with those potatoes, everything will end up being tinged yellow.
It's really a poor man's version of doing it the correct way: incorporating the color when the pasta dough is being made (green: spinach; black: squid ink; orange: tomato; pink: red beet).
Anyhow best of luck.