Learning Objective:
Compare and contrast the differences between the chrome mordant, after-chrome and meta-chrome methods of dyeing wool.

Consolidation Questions:
1. What are the differences between the 3 methods of chrome-dyeing wool?
2. Use the negative environmental implications to explain why mordant dyeing would not now be the method of choice for wool despite these methods producing better wash fastness and migration
than any of the 4 types of acid dyes without the addition of chrome.