Hello can anyone help please I am just setting up my own studio at home and trying to melt silver in a newly glazed crucible. I followed a video and glazed it myself for the first time as I have always used college equipment before. The silver melted easily but was floating in a pool of pale green clear liquid which then blocked the sprue when I poured I amm thinking it was probably the crucible glaze but how do I stop this from happening again ?