Swiss Torch : Melting Head - 247.2 Cleaners - Steamers Collecting and Classifying Coloured Diamonds

Collecting and Classifying Coloured Diamonds was created to be a joy to look at

and gemstone graders

Just as in her previous books

and fineness marks and helps you select versatile

Swiss Torch : Melting Head - 247.2 Cleaners - Steamers Collecting and Classifying Coloured DiamondsPropane, natural gas & oxygen This head has a wide circular flame, and is good for casting and working on larger pieces. It burns hotter than the standard melting head and works best with propane as the gas. Flame temperature range is 2700 2850 C. Approximate flame size diameter : 5mm x 20mm Recommended pressure settings oxygen 12 PSI, propane 8 PSI