When it comes to boro glass, playing with color is what it’s all about. Sure, some of the colors are WYSIWYG, but those aren’t the colors I especially like to play with. What thrills me is when I take one color of glass, stick it in the flame, play with it, manipulate it, and it does all kinds of things on its own. Different flame chemistries will change what you get — too little oxygen to completely let the propane burn will do one thing, more oxygen than needed to completely combust the propane will do something else, and just the right amount of both will be different still.
Then there’s what happens with temperature changes — keeping it hot all the way versus letting it cool down and then reheating (aka striking). Not always a predictable or totally controllable reaction, but a big part of the fun.
Then there’s what happens when you layer one color over another. One of the best is actually NO color (clear glass) over a color. Where the color is on the surface will have one look while the color under clear will have a totally different look.
One of the favorite color reactions I’ve seen in boro is the beads I made with Chinese amber glass as the base, rolled in Northstar Butterscotch large frit, then encased in clear. It looks like there is purple and blue glass in there, but no! It’s an illusion caused by the reaction of the glass that is there with each other.