Protect components from direct flame with this clay-like heat sink. It protects most stones while your are soldering around them, and it acts as a barrier between the stones and flame, so stones don’t have to be removed. Effective for direct-flame temperatures up to 5,000°F (2,760°C). Non-toxic, odorless clay-like material washes off with water. Handy applicator syringe included; replacement syringes are available.

please note:

• Not recommended for softer stones such as turquoise, coral, malachite, pearls or opal.
• Do not quench—air-cool after soldering.