Artist Pure 63/37 is designed with the glass artist in mind and comprised of 63% Tin and 37% Lead 63% tin and 37% lead has a eutectic melting temperature point of 361°F Offers a smooth, clean, bright finish due to the eutectic melting point which freezes instantly. Ideal for both beginners and the experienced artisan. Can also be used for general purpose work or repairs WARNING: This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to the offical Proposition 65 Warnings Website.