Question
The Color of Chemistry Dyes, Dyeing and Chemical Bonding
Data Sheet:
Wool Acrylic Polyester Nylon Cotton Acetate
Methyl Orange
Malachite Green
Crystal Violet
Congo Red
Alizarin
Alizarin +Alum
(Pre-Lab Questions)
1. Which of the dyes used in this experiment are considered to be azo dyes? Why does this name apply?
2. Redraw the structure of methyl orange, and identify the groups in the dye that will bind to ionic and polar sites in the fabric.
3. Look at the list of fabrics that are woven into the multifiber fabric. Which do you suspect will be the most difficult to dye. Explain why.
4. Propose the kinds of attractive forces that might bind Congo Red to cotton fibers.