Please note: This is a factual description of my experience in this instance and nothing else.

I use beeswax in some of my products. I had family member with a hive as a reliable source for a long time and took the supply for granted.

Upon losing this supply last summer I went online and got what seemed to be a reasonably priced and reviewed shipment of beeswax from an unnamed online source.

I was not happy with the results of the product and was concerned about the source. Upon initial research I discovered that beeswax in particular is commonly adulterated in the global market and testing for adulteration is difficult.

Upon further research I discovered that some cursory tests can be done with UV light by using fluorescence.

The basis behind this type of test is that some substances will 'glow' when exposed to UV light of a certain wavelength and you can make some determination of the content of that substance based on the subjective color value of the glow. If you have ever been at a club with UV lights and see that small particles of dust appear to be bright white which would otherwise be invisible -- this is evidence of that effect.

Link to experiment.

Text from page:

Done in a dark bathroom with a generic fluorescent UV "black light", which gives off 350nm - 400nm (peak 365nm) 'long wave' UV light. Shot taken with Canon Powershot E340HS, then it was cropped and text was added in Photoshop and saved as PNG; no other editing done. Unfortunately the blue glow of pure paraffin looks dull -- its fluorescence in person is more like a blue glow-stick (as can be seen by the plastic cup glowing).
According to the Journal of the American Institute of Conservation: "Beeswax fluoresces yellow or, when old and oxidized, orange." (https://cool.culturalheritage.org/jaic/articles/jaic37-01-005_4.html)

According to the Australian Institute for the Conservation of Cultural Materials: "Paraffin wax...Fluoresces blue" (https://aiccm.org.au/network-news/summary-ultra-violet-fluorescent-materials-relevant-conservation/)

My unprofessional, subjective determination is that the Chinese beeswax is adulterated with paraffin as it glows with a blue hue. The local beeswax is unadulterated as it glows yellow (note that 'fluorescent yellow' is slightly greenish, do an image search for 'yellow glowstick' for confirmation).

End of story -- I eventually found a local supplier with hives and sourced from them and it their product is great; but I would rather use pure paraffin at this point than trust unknown suppliers of beeswax which could have anything in it...