Class B Fire Smoke Color / Class a fires (designation symbol is a green triangle) involve ordinary combustible materials like paper, wood class d fires (designation symbol is a yellow decagon) involve combustible metals such as magnesium that will determine the severity of the fire, heat radiated, reach of the flames, smoke etc.

As a kid i set my friend's kitchen on fire melting potassium nitrate and sugar on the stove, so be careful when making these cool colored smoke bombs, which use oil pastels as pigment.