Silver coloured bronze (or white bronze) is particularly difficult to fire, or my kiln has problems and the temperature is not even. Besides, this bronze does not have a very wide firing temperature range
When it overheats , the bronze starts to melt and the result is mostly a ball of metal . But every now and then some of the metal starts to bead up which gives a very interesting look. These near misses become really unique pieces that I keep and sell of course.
I have tried in vain to reproduce the phenomenon but it depends on the space in the kiln, the number of pieces firing, the location high up in the charcoal containers and I have had dozens of pieces lost for 1 or 2 such pieces.Besides, impossible to get this effect with yellow bronze or copper. 😀