Cryptic crossword clue
Rejected formulae containing chemical compound  4

The most common and most likely answer to this crossword clue is the 4 letter word ALUM

A
L
U
M


Buddy explains!

The straight part
We know that "chemical compound" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case chemical compound = alum.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does ALUM mean?

ALUM noun
  1. An astringent salt, usually occurring in the form of pale crystals, much used in the dyeing and tanning trade and in certain medicines, and now understood to be a double sulphate of potassium and aluminium (K2SO4·Al2(SO4)3·24H2O).
  2. Any similar double sulphate in which either or both of the potassium and aluminium is wholly or partly replaced by other univalent or tervalent cations.
ALUM verb
  1. To steep in, or otherwise impregnate with, a solution of alum; to treat with alum.
ALUM noun
  1. (shortening) A past attendee or graduate (of either gender) of a college, university or other educational institution.

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