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What this site is

A practical reference for people who fuse glass. Not a gallery, not inspiration — the place you check before you fire.

Glass fusing has an information problem. Colors shift in the kiln, glass is expensive, firings take hours, and most of what’s online is either a gallery of finished pieces or scattered forum advice of wildly uneven quality.

Neither of those helps at the moment you actually need help — which is usually with the kiln loaded, one sheet of something left, and a specific question you can’t get a straight answer to.

So this site is the practical layer: tools that answer a specific question at the moment you have it, patterns you can cut against, and guides that explain what’s actually happening rather than telling you to just follow the numbers.

Who’s behind it

Linda Hart

I’m Linda. I started in stained glass more than forty years ago, watching my mom do it. From there it was mosaic, and most other things you can do with glass. Fused glass I only fell for about a year ago.

That gap is more or less why this site exists. Forty years around glass means I know what a straight answer looks like. One year into fusing means I still remember exactly which questions were hard to get one for — and how much glass it cost me to find out.

I also run Hart Glass Creations. That’s where the work I make lives. This site is the other half: the tools and the reference material, kept separate and free, because the thing that was missing when I started wasn’t more finished pieces to look at.

The standard

A wrong technical claim costs you real money and hours of kiln time. So there are rules here:

  • Nothing gets invented. Firing schedules, COE numbers, glass behavior, product specifics — if it isn’t verified, it doesn’t get published. Where something is genuinely uncertain, it says so.
  • Numbers are starting points. Every temperature and hold time on this site is a place to begin your own testing, not a guarantee. Kilns vary.
  • Sources are linked. The color data in the Color Pairing Tool is Bullseye’s own published data, and every match links back to their page for that style number so you can check it yourself.
  • The math is named. The color wheel and its harmony schemes are Newton’s geometry, straight out of Opticks (1704). Matching a color to a real sheet is not — that happens in CIELAB, a color space built from measurements of human vision, because equal distance there means roughly equal difference to the eye. Any tool with a hue wheel can claim Newton. The part that decides which glass you buy is the part worth naming.
  • “It depends” is followed by what it depends on. An answer that leaves you no better off isn’t an answer.

Where it’s at

Early, but less early than it was. There are nine tools built and working now — color, cutting, templates, stringers and reactions. Patterns, projects and the guides are being worked on, and nothing appears in those sections until it genuinely exists — you won’t find placeholder cards for things that haven’t been made.

Open the Color Pairing Tool