Definition that contains coloring material
- stain (microscopy) a dye or other coloring material that is used in microscopy to make structures visible
- pigment dry coloring material (especially a powder to be mixed with a liquid to produce paint, etc.)
- litmus a coloring material (obtained from lichens) that turns red in acid solutions and blue in alkaline solutions; used as a very rough acid-base indicator
- litmus test a coloring material (obtained from lichens) that turns red in acid solutions and blue in alkaline solutions; used as a very rough acid-base indicator
- hematochrome a reddish coloring material found in some algae