I'm on my third day of colour tests, and am beginning to feel slightly fed up. Although I know it's practical to make colour samples and technical notes - I just want to play!
So - I allowed myself a little time off, and here are the results.
After firing the black, I sifted some transparent green over one side, and some transparent blue over the other.
The second one:
Here is a closer look at the effect - click for a much larger image.