Crossword Genius

Almost nothing that is absorbing moisture, initially, drying mixture (4,4)

Ross

I believe the answer is:

soda lime

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'mixture' is the definition.
(I know that soda lime is a type of mixture)

I can't explain the rest of the clue.

Can you help me to learn more?

(Another definition for soda lime that I've seen is " mix of chemicals".)

I've seen this clue in The Guardian.
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