Glass Reaction Checker

Prevent "poodle effects" and dark reaction lines in your fused glass projects.

Go to Glass Artist Toolkit

How this works

Certain glass colors contain Sulfur (mostly warm colors) while others contain Copper or Lead (mostly cool colors/turquoises). When fused together, they form Copper Sulfide or Lead Sulfide, creating a dark outline.

Related glass tools: Once you've verified your glass palette is safe from sulfur-copper/lead reactions, generate a safe firing profile using the Kiln Firing Schedule Generator. If you are mixing your own enamels for the piece, calculate the exact liquid-to-powder ratios with the Enamel & Frit Mixing Calculator.

This tool was created by Ben Crittenden, a Project Management Professional (PMP) with experience in web development and systems administration.