Vaseline glass containers are clear, yellow or yellowish-green glass pieces made with 0.1% to 25% uranium dioxide. Many different kinds of glass can have a yellowish-green hue, but the thing that sets Vaseline glass apart from the rest is the fact that it glows green when it is exposed to UV light.

Is vaseline glass always green?

In other words; The fluorescence of vaseline glass is always green. Either red/orange fluorescence or blue/greenish-blue fluorescence means NOT vaseline (or uranium) glass. A portable ultraviolet rays lamp is so called a "BLACK LIGHT", and you can buy in a large electric appliances store.

Is vaseline glass yellow or green?

“Vaseline Glass is a particular color of yellow-green glass that is made by adding as little as 0.1% to 0. 2% Uranium Dioxide to the ingredients when the glass formula is made. The addition of the Uranium Dioxide makes the glass color yellow-green.