My attempt to stabilize chrysocolla.

I've tried this method before and like Phil, I only got it to penetrate 1/8".

I have had more success heating the stones up and using Hxtal (Michael's method), reapplying to the surface a few times during 4 or 5 hours, sometimes it will wick through the stone completely if I keep it hot enough. I check it every hour or so and reapply when it has soaked in. I then remove it from the heat and let it cure for a week.

(Hxtal is a water proof, UV proof, non yellowing, glass repair two part epoxy) www.hxtal.com/