It really all depends on the design of the item you are making as to whether it matters or not. Many pieces of enamel are set, in much the same way as stones are, so soldering and temperature are not an issue.
Thompson is only one of many brands of enamel
No, I mean transparent. The enamels generally come in 3 versions transparent, opalescent and opaque. The opalescent version is semi-transparent.
It depends on what your design calls for ;-)
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