OK. I can't do two things at once. Like take photos and teach a technique. I forgot. Sort of. Anyway, here are three snaps taken during the rock-dyeing, with my examples, the rock and one teaching shot.
What we did:
Wrap and rubberband silk scarflets around different sizes and shapes of limestone rocks.
Paint each piece with low-water dye mixtures, using Procion MX dyes that are mixed colors -- rust brown, Chinese red, bright green, rust brown were the choices I premixed with a soda ash solution.
Microwave for 2 minutes.
Unwrap and wash, revealing interesting shapes, textures and colors.