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- They turn litmus red
- __ rock
- It turns litmus red
- Caustic and biting
- Substance which turns litmus red
- It's corrosive
- Caustic liquid of many kinds
- Bitter or sour
- They have a sour taste
- Like some terrible reviews
- It is neutralised by alkali
- A firm thousand got Timothy back to do the dirty deed
- It makes Father sour to come back around in a 8 down sort of way, in short
- 21 across makes such a detective matter quite poisonous
- Not a sweet detective matter