A bought a gallon awhile back and it is indeed 99% pure. You can tell by the lack of smell. As far as PF is concerned, I won't buy from them. They are expensive and I wonder about the actual purity of the chemicals they sell. As I said the Chemistry Store's TEa is intended for topical use in lotions and so cannot contain DEA or MEA. The liquid is viscous, water white and has the correct Sp Gr for TEA 99%. I used it to make up an ascorbic acid developer (Dimezone, ascorbic acid, TEA, propyelene glycol) and it worked fine. They also sell several other chemicals that are of use in photography such as hypo. sodium sulfite, sodium carbonate, propylene glycol, Triton X-100, etc. They also sell PET bottles. Their prices are more reasonable than most other suppliers.