Hmmm, well I didn't really measure it, because I just poured it in from a full pigment jar... But If i had to guess, I'd say about 1/4 teaspoon, but not at the same time. Gently pour in about 1/8 teaspoon first, shake it, then add the rest. You have to shake it like there's no tomorrow though... Its not as smooth as I'd like it to be, but its getting there. I want one of those paint shakers like they have at the home depot... that would fix it! The bottle of nail polish wasn't completly full either... it was like 95% full or so though. I'm still playing, but so far so good!
~may_cup