Juan,
I had a student using kerosene in one of my workshops. It caused another student who was working nearby to get pretty sick. I think the fumes are pretty toxic.
I have tried various walnut oils for brush cleaning. In my experience the non-artist ones are thicker so the sediment stays suspended. This requires more frequent replacing of the oil in my cleaning jar. The M Graham walnut oil isn't as viscous so it can be used for a longer period of time before I dump it out.
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