caustic substance crossword clue

 The answer to the crossword clue "caustic substance" can be one of the following words:

LYE (3 letters)

ACID (4 letters)

LIME (4 letters)

These words all refer to substances that can cause burns or damage to skin and tissue. They are often used in cleaning products and industrial processes.

Here are some more details about each of these substances:

Lye is a strong alkali that is made from the ashes of plants. It is used in soapmaking, metal cleaning, and drain cleaning.

Acid is a substance that has a pH of less than 7. It can cause burns to skin and tissue, and it can also dissolve metals.

Lime is a basic substance that is made from limestone. It is used in mortar, concrete, and whitewash.

I hope this helps! Let me know if you have any other questions.