I experimented with an easy way to create a simple pattern with colored porcelain that also creates a more complex one that only emerges when backlit, I used coils of porcelain colored with Mason stains and the opacifier Zircopax.
Haven’t done anything with it yet, other than make test tiles, and I’m sure there have been lots of creative techniques used out there to do similar.
I'm using a glassy porcelain that melts and slumps to much to use for most projects, if anybody tries this you should get good results with one of New Zealand kaolin based porcelains.
Praseodymium stain for yellow.
Wedgewood for blue.
Zircopax for white.
Test tiles are about 3/32" thick roughly an inch wide
The photos are of a tile lit from the front, then backlit with a led bulb.
I twisted two coils together, one with a small amount of blue stain the other uncolored porcelain, then Inlaid them into a slab of lighter blue making a simple twist pattern, when lit from behind a more complex pattern appears.
Here is a pale blue and pale yellow twisted, where the two colors overlap it creates green when lit, doesn’t stand out much though.
This one is a white coil twisted with a uncolored porcelain coil then inlaid in white, so you can only see half the pattern when not backlit.
Hope you found these interesting.