Related Clues:

• Acid/alkali test dye
• Acid or base indicator
• Acid test substance
• Chemistry paper
• Kind of test in literature, to sum up
• Paper that turns blue in alkalis
• A dye used as a rough indicator of acid
• Useful chemical features endless stimuli when shaken
• Kind of paper that's taken in chemistry test
• Acidity-testing strip
• Chem lab colorant
• Indicator of base books with lots of mawkishness
• Red/blue chemical test
• Acid test paper
• Chemistry lab indicator