The only way you can make it gray with food coloring is if the substances you are making the volcano out of is white. You will have to add black food coloring drop by drop until you have the color gray you want. If you can't find black food coloring, mix every color you have together then drip it in. All of the colors mixed together will make black.
Opposite colors on the color wheel should give you grayish results such as mixing red and green. You can add a touch of blue to achieve a bluish gray or a tad bit of yellow to make a brownish gray.
Gray
You can not make candles with food coloring, they are made out of WAX.
the food coloring
hell no. looks can be decieving. Food coloring is only used to make food look more appealing.
can you tie dye shirts with food coloring
Yes this site has instructions.instructables.com/id/how-to-color-stuff-without-food-coloring/
for an example:I added food coloring to the water to make it look pink
In food coloring it is about 5 drops of yellow to one drop of red food coloring.
Blond food coloring for dying hair can be made by using yellow food coloring. Put two drops of the food coloring on a cotton ball and run it over the strand of hair that is desired to be dyed.
mix rainbow cheese with cream cheese and food coloring