Possible Clues:

• The base of not a CID matter?
• Chemical with a pH greater than seven
• Mixture of soluble salts found in arid soils and some bodies of water
• A CID could never be so base
• Soluble mineral salt
• Anything so base could never be a CID matter
• Potassium hydroxide is one
• Compound of aluminium and potassium and initially lithium
• Acid-neutralising substance
• Litmus tester