Snow in resin

Hi All

I’m looking for an answer to this question for so long I actually think it is a big mistery 🙂

I’m sure you have seen wood/resin hybrid necklaces and rings with “night sky” kind of look that have a thin layer of white smoge/fog, laying on the bottom, where wood meets resin.

Any idea is this some different opaque, white resin? I saw on some russiam you tube tutorial a guy that was sprinkling top of his resin with white stuff from a spoon that later dropped on the bottom and created that very effect but what is it?