how much of powder is need for an experiment

considering i needed 2 pellets at same time, my sample is going to be 0.2g.
best ROA ?
right my sample has arrived i got one 0.2g sample of 6-apb powder, and one 0.2g sample of mdai, the 6-apb looks like half the amount of the mdai, (i will check weight later)
both are white & look exactly the same,
testing the 6-apb with marquis i was quoted it should turn deep purple like pellets but on the 6-apb thread someone mentions if its real it should turn orange/brown,
i will be testing later too, ive lost my cable to connect phone to laptop so will not be able to add pic of results, but will report the colour back.