Blue is a blue melted marble. Use caution when trying this, since glass is fired at a lower temp than glaze, also allow time to anneal. There are some blue glazes that can achieve a nice transparent look as well.
laura carlin Laura Carlin is an Illustrator based in London. Her latest project, The Iron Man by Ted Hughes published by Walker Books and Faber came out late She is currently working on a few new book projects.