Related Clues:

• Dye used by chemists
• Literature problem raised in sort of test paper
• Settled problem over paper used in chemistry test
• Stuff that turns red in acid
• Word before 'test' or 'paper' in chemistry
• Acid test stuff
• Kind of basic test (that turns red or blue)
• Books and letters providing material for test
• Colouring material used in acidic/base testing
• Acid test material
• Chemistry test paper
• Threw some light on problem arising in test paper?
• Chemistry paper?
• Lab dye; slum it (anag.)
• Dye material from lichens, used in acidity tests