Whoa there pal!!!
A way too powerful dose of pure Salvinorin A is about the size of a single grain of salt, or smaller!!! You will need an extremely accurate scale to weigh it out correctly!!!
This is not something you want to try to eyeball a dose of!!!!
You should check out sagewisdom.org!!
I think there is a dose amount there for pure Salvinorin.
It is Daniel Sieberts site, he is kind of the "authority" on Salvia. There is a page there somewhere that he talks about the time he tried what he thought was going to be a totaly inactive amount of pure Salvinorin. It was left over from when he was trying to isolate the active chem in the Salvia leaf, if I remember correctly. He was violently thrown out of this conscious reality.
It was so far more, than way too much for him and he is one of the people responsible for bringing Saliva into modern attention, so its not that he was inexperienced at all.
This, from an amount too small to handle with bare fingers!!!
Be Careful!!!
and please, check out his site before trying this!!!
WS