blanching agent

NOUN
15 LETTERS · STARTS WITH B

blanching agent is a valid 15-letter word worth 23 points in Scrabble and 30 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
B3L1A1N1C3H4I1N1G2A1G2E1N1T1
3 + 1 + 1 + 1 + 3 + 4 + 1 + 1 + 2 + 0 + 1 + 2 + 1 + 1 + 1 =23 PTS
DOUBLE WORD → 46TRIPLE WORD → 69
MEANING

What does blanching agent mean?