A few weeks ago I have bought Japanese resin clay called "Sukeruku". The reason behind my purchase was a promised ~ 85% transparency effect after drying. I was rubbing my hands in anticipation that at last i will be able to make a "glass" miniature jars and other useful minis. Here is my trial of the clay:
When I mixed some golden powder into raw clay i got strange yellow color somewhat transparent, but still not what I was looking for. You can add oil pain to it, but instead of transparent you will get opaque color "on transparent side":
The texture is pleasant. It is air dry and very easy to work with, not sticky, smooth and silky. But you need to be fast as it drying quickly. It is very oily, even after drying have some oily patches on it. Washing the ready product with soapy water has partly cured the problem. Also this clay is flexible after drying and not brittle at all. Have some funny smell to it, but not repulsive.
There is a good side i love about this clay - it shrinks! About 30% from original size, which is very handy for my miniatures.
I have achieved promised level of transparency by rolling it very thinly:
So....i think clay is perfect for miniature ice cubes, mini jars, glasses and cups once you will get used to this interesting product.