Hopefully I got this posted in the right spot. I know there has been lots of talk about mixing micas in water or oil with a marble in the bottom of the bottle. I see that TD is in a lot of the micas so I gave it a shot. Some seemed to mix OK I guess, although the mica did settle to the bottom of the bottle after it set for a while. For those that didn't mix well I used 1 part glycerin and 3 parts water. It did seem to blend better. I'm not sure if I should put a preservative in the bottles of the ones that have glycerin (I'm sure I will not be using them up for quite a while). Anyone have thoughts on the glycerin/water mixture and if I should add a preservative?