Related Clues:

• Dishwasher setting
• Turn blue, maybe
• Henna, for one
• Litmus, essentially
• Stuff in a robber-foiling pack
• Shampoo finish
• It may be red
• It changes locks
• Washing machine cycle
• Salon application
• Car wash step
• Food additive
• Textile company purchase
• Indigo, for one
• Turn red, perhaps