Clue: It turns litmus red

Answer: ACID

Length: 4

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Similar Clues:

• They redden litmus (ACIDS with 5 letters)
• Arguably redundant name for a hygienic item (QTIPCOTTONSWAB with 14 letters)
• This turns litmus red (ACID with 4 letters)
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• ___ acid (substance that turns turmeric paper reddish-brown) (BORIC with 5 letters)
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