Why is the crystal photo frame yellow?

The first is that the material itself is a little yellow, and then it will become more yellow after a long time. Very few crystals are actually made, and 99% of them are replaced by glass, because the cost of crystals is too high and it is very troublesome. It takes dozens of processes to make a photo frame.

The second possibility is that crystal photo frames are basically made of glue. If the residual glue on the edge is not removed when gluing, the glue will turn yellow, and then through the transparency of the crystal, your vision will think it is crystal yellow, which has the quality of crystal shadowless glue, and some bargains will turn yellow.

reference data

Edit. Encyclopedia of teenagers. China: Juvenile Publishing House, 2005.