mordantsalt
nounUK /ˈmɔːdənt sɔːlt/
US /ˈmɔːrdənt sɔːlt/
A special salt that helps dye stick to cloth so the color stays bright.
The craft teacher added mordant salt to the dye bath so the children's shirts would keep their colors.
OTHER MEANINGS
2. A metallic salt used in dyeing to bind color to fabric.
Alum is a common mordant salt used when dyeing wool.
3. A substance used in leather tanning to help treatments soak in.
The tanner applied a mordant salt before the final finish.
4. Any salt that helps a stain or color attach firmly to a surface.
Chemists tested a mordant salt to make the ink last longer on paper.