Sample weights of dental calculus

All samples of dental calculus taken in surveys in China were less than 0.1mg. In other similar studies, samples vary in weights such as 0.01mg, 2mg, or more than 10mg.

This analysis is my initial survey, and after getting results, I'll take more amounts of samples from my next surveys as possible.

Now, I'm starting disssolve the calcified matrix by immersing the calculus in 10% HCl.