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November 8, 2018

Test Results :: Cotswold Blue



CiM Cotswold Blue (CiM554) is a medium teal opaque. It's a bit reactive with Ivory, but is otherwise fairly well behaved. My rods of Cotswold Blue were mildly shocky, but I liked it enough anyway to order a full pound of it, so I clearly didn't mind it all that much.


Cotswold Blue doesn't change colour when you reduce it.


Silver leaf on top of Cotswold Blue largely disappears, beading up in tiny little silver granules on the surface. When the silver is reduced an encased, it turns an odd mustardy colour.

The Cotswold Blue bead with silver on it cracked. You can't see the cracking in the photo very well, but it cracked on a diagonal under the clear. More and more, I am realizing that these darker teal blue colours (Petroleum Green, Rainforest, and this one among others) encase just fine until you add silver, but that the addition of silver somehow tips the crack balance. I'm not sure why this is the case, but am glad that I'm finding a pattern that will make this problem easy to avoid.


Cotswold Blue is a very pretty base colour for striking silver glass, and I got nice colours from my TerraNova2 frit on top of it. Its colour isn't really conducive to hosting the reducing silver glass colours since it is so similar, but you can see that there was some interesting spreading behaviour in that frit in the leftmost bead above, too.


Copper Green, Ivory, and Opal Yellow all separate on top of Cotswold Blue. Cotswold Blue is such a streaky colour that it separates on top of everything.

The only real reactions of note here were:

  • Ivory and Cotswold Blue form a mutual dark line reaction
  • The edges where Peace and Cotswold Blue meet get sort of fuzzy and translucent. You can see this in both beads.


Here are some other beads that include Cotswold Blue: