You’ll need chemistry knowledge and more to solve this cryptic crossword!

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Squares filled: 0/164
Exolve Print Notes

Across
1Thumped dunce got pH confused (7)
5See 3d (7)
9Bring it around to restrain horse (7)
10Muddled multiethnic etc removed for element (7)
11Russian chemist mistakenly delivered me mint (6, 9)
12See 18a (6)
14Cup leper prepared for herbalist (8)
17Restrain wild areas (8)
18, 1218, 12Others trying to unravel this idea? (6, 6)
21Confused choristers elope for analysis (15)
24Path a Northerner took to find hidden furnace (7)
25Internal mail a mosque returned to African country (7)
26President in style confusion (7)
27Any salt compound for chemist (7)

Down
1Tried mixing 5 down for olivine (7)
2Ran online puzzle-not straightforward! (9)
3, 5a03, 5aPreachers sob about ammonia production (5, 7)
4Smut a leading Dame returned for points (6)
5Element symbolic of an Italian river? (8)
6Ten photos developed there and then (2, 3, 4)
7Even he’ll hit the top! (5)
8Mar a small sovereign for tea with 11 across? (7)
13Treats can turn into chemicals (9)
15Dissenting chemist sounds clerical (9)
16Radon ran amok for European (8)
17See 19d (7)
19, 1719, 17Get that parsley prepared for treatment (7, 7)
20Blended hashish not hot in this pipe! (6)
22Radical lye and thorium compound (5)
23Strum balalaika for concealed dance (5)