What are they for? And yes, I have checked NEI. They only show up as part of the liquid registry. I suppose it is worth mentioning that I'm not actually using FTB (yet) because I generated a world before using it, but I've built my group of mods around those in the FTB packs. BTW, you get these chlorite cells from electrolyzing ender pearl dust, which I had to do for beryllium cells for neutron reflectors. I also found a use for the potassium and nitrogen cells you get - saltpeter. You know: saltpeter -> gunpowder -> TNT -> ITNT for implosion compressor. So as you can see, I've used up all the great stuff you get from electrolyzing that stuff except for these mysterious chlorite cells. Even Google surprisingly did not help me on this, otherwise I probably wouldn't be posting. Anyway... any ideas anyone?