Opacity tests with Sheet and Powder

I'm playing with a bunch of whites (yes, that may be crazy) to see what levels of opacity they each have  at different densities. Here's the kiln:

From the top left down: Spectrum, 1g, 2g, 3g, 4g; BE Dense White 0313 2g, 4g, 6g. 

Next column from top: BE French Vanilla 0137 2g, 4,g, 6g; BE Opaque White 0013 2g, 4g, 6g\

Third column: BE Opaline 0403 2g, 4g, 6g; BE White Opal 0113 2g, 4g, 6g. 

Fourth column: 15g Clear Medium Frit with: BE 0313 2g, 4g, 6g; BE 0113 2g, 4g, 6g

The circle is a drawing with BE 1464 sifted over it for engraving. Under is is the same thing 15g clear with 0403 left to right, 2g, 4g, 6g. Below it, left is 0137, right is 0013

And here they are when they came out of the kiln:

I think I need to get a more accurate scale and sift the powder tiles on it directly, then I'd get an even coat. The opal white on sheet I think is something that I should experiment with more, I think it would be quite useful in layering up images and playing with visibility and layering. I will also experiment with layering it with other colours for engraving, I think it might serve to add more range to other whites when I'm cutting through them.

I think maybe I should make myself a gelflex mould for doing a freezing test.