"The most typical color of uranium glass is pale yellowish-green, which in the 1920s led to the nickname vaseline glass based on a perceived resemblance to the appearance of petroleum jelly as formulated and commercially sold at that time. Specialized collectors still define "vaseline glass" as transparent or semitransparent uranium glass in this specific color.
"Vaseline glass" is now frequently
used as a synonym for any uranium glass, especially in the United
States, but this usage is not universal. 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." SOURCE