either black or a very dark grey
black
White is the product of all colors mixed together.
White and gray together will make a lighter gray. Red and green will make a brown. Light gray and brown together will make a neutral color, also called greige or a greyed brown.
Black and pink obviously make purple!!!
black
grey
White is the product of all colors mixed together.
Black - or a very muddy charcoal gray - is achieved by mixing all colors together.
Black and grey mixed together makes really dark ash like grey.
Black & White
Black mixed with grey
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.
They make a gray.
White and gray together will make a lighter gray. Red and green will make a brown. Light gray and brown together will make a neutral color, also called greige or a greyed brown.
maroon
all of them mixed together
Black and pink obviously make purple!!!
All colors mixed together.