either black or a very dark grey
Black and white mixed together create the color gray.
Black and white make a greyish colour but if you put more of one the colour may vary
Silver and blue mixed together will create a cool-toned shade of light blue or a bluish-gray color.
White is the product of all colors mixed together.
Mixing the primary colours will result in black if the colours are equally mixed, and brown if they are unequally mixed.
Black and white mixed together create the color gray.
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 and white make a greyish colour but if you put more of one the colour may vary
Silver and blue mixed together will create a cool-toned shade of light blue or a bluish-gray color.
Black & White
White is the product of all colors mixed together.
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.
Mixing the primary colours will result in black if the colours are equally mixed, and brown if they are unequally mixed.
Depending on how much of each color it varies from Brown,Bluish-green,Gray,or dark gray.