I had bought a piece of slag glass off of Ebay to tumble it.
I thought it looked pretty clean to start with.
Slag Glass is considered one of the more 'advanced' materials to tumble because it is softer than many types of rock (and even many forms of obsidian).
Shining a LED flashlight through the finished piece gives a crazy photo (below).
Photo #38A
As with all translucent tumbled stones/gemstones you are able to see just deep enough into them to spot the imperfections. Camera flash doesn't help: makes a bit of an odd photo.
Photo #38B
A video is better to show under normal light.
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