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Summary: Flux will allow your solder to stick to your lead, so be sure to use it on your stained-glass project. Learn more about working with stained glass in this free video series.
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About the Expert
Amanda Claire Amanda Claire is a lifelong artist, currently living in Austin, Texas, who specializes in all realms of unique crafts. read more
So something else that you need is a chemical called flux and what flux is, is a solution, for stained glass it is usually a solution of zinc chloride, and basically without flux your solder will not stick to your lead if you are using lead cane nor will it stick to your copper foil if you are using the foil method so think of flux as the glue which allows your solder to stick to your lead or your copper which then will hold your stained glass together. Now it is a very thin solution, it is very watery and if we open it up, oh you will also need a flux brush which is kind of what this is, it is basically just a thick bristle paintbrush that is on kind of a metal shaft here. But you can see it's just, it's kind of, it's a little bit you know, you know it's a little bit thicker than water but it is clear, but what it does, the way you use it, is you brush it onto either the lead or the copper foil in a very thin layer before you solder and then that will allow the molten solder to find to that metal. So you have got to have flux, a little flux brush and so you can't do stained glass without it.