Identifying Vaseline Glassware?This is a page about identifying Vaseline glassware. This type of glass has be dated back to 79 AD where some was used in a Roman mosaic. Vaseline glassware glows a bright green under ultraviolet light due to the uranium in the glass. Under normal lightening it is a yellowish green color. It is commonly called either uranium or vaseline glass (due to it resemblance to petroleum jelly).