Re: Heat treating Tiger Eye.
I've heat treated yellow tiger eye to turn it red in an ordinary kitchen oven, although it's been long enough ago I don't recall the exact details regarding temperature or time. If I were to do it again I'd probably start at 350 degrees for an hour or so and adjust from there based on the results.
I'm not so keen on red tiger eye personally, but was motivated to experiment with making it when a bead supplier fell short on red. One thing I learned from the process is if you start with a lousy grade of yellow you will have an even lousier grade of red at the end...
You may want to consider placing the pieces you are treating in a container filled with sand. The general idea behind that is to create a larger mass so the pieces heat and cool slower and are not subjected to thermal shock, although I'm not sure that is really necessary with tiger eye.
Experiment with it and you'll find the settings and technique that work for you.
From Bob Keller - December 29, 2012 at 22:54:14