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I make candle bridges, using the Bullseye 8903 single candle mold. Each time I do a slump using these molds, I mark the center points of the blanks, as well as the center points of the molds. I use a black Sharpie to mark those points, and the marks help me to align the blanks fairly precisely on the mold.

Measuring the molds every time I use them is a pain, so I have been scratching center marks into the sides of the molds to keep from having to re-measure. The problem is, those scratches are not the easiest thing in the world to see - especially if they've been semi-filled with kiln wash.

So is there some way of making a alignment mark on the mold that will be highly visible, and will stand up to repeated firings up to 1250 F? I'm not a pottery guy, but I'm guessing there's some sort of glaze pen or something I could use?

Thanks.

Something like this would do it. Mark the mold and it should be permanent after firing. Is there a spot on the mold where you can see the mark OK but does not require kiln wash? Not sure whether you would be able to see it through a separator.

http://www.bigceramicstore.com/tools-su ... -pens.html

use a dot of vitreous paint

Why not cut a piece of Mylar, that fits in the center indentation of the mold, and poke a hole the size of a sharpie point. It will last forever if removed before firing, you can use it on multiple molds and the marks will be visible after kiln wash application. If you're using opaque glass and need the makes on the sides cut a piece out that will lay over the top of your mold with notches cut out to mark. This jig you could measure and use to make your blanks as well.

Metallic sharpie. Just add a dot under the edge.