I would not use it because it might not come out of your hair.
Wash with water and shampoo and the food coloring will come right out.
Yes it is safe but becareful: if your hair is fair and damaged the colour might not all wash out.
Wash your eye out with cool water.
This should be safe - food coloring is edible and water soluble so there shouldn't be any concerns about toxicity. However, depending on how long you leave the food coloring on the bath tiles, you may have stains left on the tiles after you wash the excess off.
It is perectly safe to wash your hair during any stage of pregnancy.
no
Yes.
Yes.
Well, If you have dark hair wash it in vinegar before you have fun at a pool or beach. If you have blonde hair wash in lemon juice before going in the sun! NO Sun-in. It destroys your hair and it turns orange!
no
Well, all you need to do is put shampoo, conditioner works too, into a bowl. Mix the food coloring into the shampoo/conditioner, and if it starts to look weird, add alittle bit more of the shampoo/conditioner. Apply to hair. Wait till hair is DRY. You can use a blow Dryer to make it dry quicker. When hair is dry, wash it out with COLD water, using warm water will make dye leave hair.
I will strongly advise against it - while food coloring is safe to eat, it may not be properly balanced to avoid irritation or causing infection in your eye. Also, I am having a hard time figuring out why you would put food coloring into your eye - it will come right back out with your tears and wash away quickly, leaving you with watery painful eyes.