Related Clues:
- It turns red in acid
- Regal color
- Acidity detector
- It turns red with acids and blue with alkalies
- It turns red in acid and blue in alkali
- Paper used to test for acid or alkali
- Imperial colour
- This paper is used to test whether solution is acid or alkaline
- This paper is used to test for acid or alkali
- Colour between red and blue
- Colour obtained from mixing red with blue
- Colour for aristocracy or emperors
- 'It turns red with acid, blue with alkaline (6)'
- You get nothing but a cold chop from that
- Up with the figures 'til you have it in red and blue!