I have tested glass from three different batches of CiM Sangre, making a series of rough spacer beads in various different flame chemistry conditions, oxygen rich, neutral, slightly reducing and a strong orange reduction flame. The spacers formed in the reduction flame are the only ones to show any signs of turning blue at all – and then only in small patches.
None of these spacers have been struck, you can clearly see the transparent yellow areas on many of these beads which is what Sangre looks like before you reheat it to strike to red. I find though that Sangre does strike for me fully and evenly the first time that I bring it back to the flame. The picture to the left was taken indoors under artificial lighting and the glass looks darker, like toffee apple caramel rather than the vibrant and juicy red that it's true transparent shade. The image below was taken indoors also but is lit with a daylight lamp (10,000 lux) and looks much closer to true colour.
Next I made a large focal sized bead, using just Sangre, in a strong reduction flame. The results were very interesting; streaks of light grey/blue are clearly visible on the bead after kiln annealing. This bead is also totally opaque, the longer working and repeated striking has taken Sangre from unstruck two tone transparent and on to fully opaque which personally I like. It gives Sangre working properties unique in the 104 palette and is a very versatile glass
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