 Specialized collectors still define Vaseline glass as transparent or semi-transparent uranium glass in this specific color.Vaseline glass is sometimes used as a synonym for any uranium glass, especially in the United States, but this usage is frowned on, since Vaseline brand petroleum jelly was only yellow, not other colors.The term is sometimes carelessly applied to other types of glass based on certain aspects of their superficial appearance in normal light, regardless of actual uranium content which requires a blacklight test to verify the characteristic green fluorescence.