Learning Objectives
Recognise a series of oxidising and reducing agents used in dyeing with VAT dyes
Understand their advantages and disadvantages
Show the ability to explain the dyeing profile and rationale the addition of REDOX reagents

Questions (linked with topic 2.6)
1. Draw a typical dyeing profile for VAT dyes
2. State at which points each of the REDOX reagents are added
3. Describe the REDOX reactions which might take place during vat dyeing process.
4. Explain why an alkali is required together with a reducing agent during vat dye reduction.
5. Relate the REDOX reaction process to the wet fastness properties of vat dyes.