As I have said over in the other threads but not here yet: Our aim was to
REDUCE toxidity and not increase it
. XT-I was a 1:1 clone of Xtol. XT-II was a mix where we reduced the borates but still kept some in (fear-reserve). After thourough testing and hundreds of curves we felt confident enough to come straight with XT-III which has eliminated all borates completely. They are on the CORAP list here in the EU, mostly banned already and the last remaining one (which is in Xtol) is subject to a current investigation. We have to expect this substance to be banned in the very near future. The only downsize of our new buffer is its price. But other than this you can drink it. Captura technology increases safety in handling and helps in dissolving it. Keeping properties are at least the same with a high chance to be better. So in a nutshell XT-3 is the "greenest" version out there of all Xtol based developers.