dyeretainer
nounUK /ˌdaɪərɪˈteɪnə/
US /ˌdaɪərɪˈteɪnər/
A dyeretainer is a special cup or clip that keeps a color from washing out.
She used a dyeretainer to keep her red shirt bright in the wash.
OTHER MEANINGS
2. A person hired to keep dyes and colors in good condition.
The factory's dyeretainer checked every batch of blue dye.
3. A small ring that holds a sample of dye for testing.
He dipped the dyeretainer into the vat to check the color.
4. A legal agreement that keeps the rights to a color formula.
The company signed a dyeretainer to protect its secret green.