Related Clues:

• It is neutralized by alkali
• __ rock
• It turns litmus red
• Caustic and biting
• Substance which turns litmus red
• It's corrosive
• Caustic liquid of many kinds
• Bitter or sour
• Dr. Leary's turn-on
• Like some terrible reviews
• It is neutralised by alkali
• Does that create the illusion of former wealth?
• Will this give one the illusion of money of old?
• Time was when it was worth something; now it's just an illusion
• Once this might have given one the illusion of money