Black Chromate Solution - Particles in solution

[MadChemist]

I recently purchased the Black Chromate solution for use after the Zinc coating process. I have a couple questions:

1. Is it normal for the Black Chromate solution to have solid particles that will not go into solution? They float around then settle to the bottom even after a few days. It appears to be coming from the silver solution (part B)? Does this effect performance?

2. What would the freezing point of the solution be after complete mixing of Part A, Part B and water? I know what the freezing point of water is, but often the freezing point can be depressed with other materials (road salt, calcium chloride, etc..). I was wondering if I stored the solution in my garage at below freezing temps (live in Michigan ) if it would give me problems.

Any insight would be great.