Who makes opaque enamel paint that is fairly thick for fused glass?

The line of colors includes one called emerald. If you put a cap on the painted surface it’s gets bubbly when fired, otherwise it’s a nice opaque color, slightly mottled like a natural stone surface. It’s not all watery like other paint for fused glass I’ve seen, so it’s easier to spread evenly. I believe this line has been released fairly recently. Any clues would be greatly appreciated.