Crossword Genius

Chemical used in anaesthesia, it appears I’m a surrealist! (4,4)

Ross

I believe the answer is:

soda lime

I'm a little stuck... Click here to teach me more about this clue!

'chemical' is the definition.
The definition and answer can be both substances as well as being singular nouns.
Maybe you can see a link between them that I can't see?

I can't explain the remainder 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.
Want a hint initially instead of a full solution? Install my app