>>4479760Wratten 12 is the minus blue filter. As blocks blue (and violet) when shooting false color IR film / digital imitation. (Can't find data of 12A if it's a thing.) Wratten 2A is pale yellow UV blocking filter, 2B blocks less, 2E blocks more, both also pale yellow.
For transmission curves, check
https://www.kodak.com/en/motion/page/wratten-2-filters/ (Posted this before: IR mod cheap p&s, W12 filter, flip channels)
