I have found that so far, pipe becomes these colors with these ctypes:

Non-Colored=Rbdm, C-4, Nitr, Gun, Eqve, Dust, Lrbd, Thdr, Thrm, Cflm, Firw, Fwrk, Bomb, C-5, Metl, Sprk, Pscn, Nscn, Ntct, Ptct, Etrd, Btry, Lcry, Swch, Inwr, Pcln, Hswc, Pump, Aray, Wifi, Aray, Gas, Wtrv, Plsm, Nble, Smke, O2, Boyl, H2, Acid, Lava, Dstw, Sltw, Mwax, Ln2, Desl, Lo2, Glow, Bizr, Pste, Psts, Stne, Snow, Salt, Cnct, Brmt, Sand, Bgla, Yest, Fsep, Bcol, Grav, Anar, Pqrt, Goo, Ice, Wood, Plnt, Bmtl, Wax, Glas, Nice, Coal, Brck, Fuse, Iron, Spng, Pipe, Vine, Invs, Shld, Filt, Qrtz, Neut, Plut, Phot, Uran, Amtr, Deut, Warp, Isoz, Iszs, Sing, Clne, Void, Dmnd, Insl, Bhol, Whol, Stkm, Bcln, Prti, Prto, Stk2, Wind, Hlif, Asim, 2x2, Dani, Amoe, Move, Pgol, Dmoe, 34, Llif, Stan, Seed, Maze, Coag, Wall, Gnar, Repl, Myst, Lote, Frg2, Star, Frog, Bran, Rime, Mort, Bizg, Bizs, Fog, Lolz, Love, Frzz, Frzw

Red=Watr

Green=Oil

Blue=Fire

*This will be updated, I would appreciate it if moderators don't edit it to add others, if they were thinking to, just in case. :D

*****This is EVERY element including life and secret and eqve*****