I actually have a recent example : I do woodworking and for the last step of finishing some of the thing I build, I use a mixture of beeswax and linseed oil. Beeswax has been harder and harder to find locally. Not so long ago, every hardware shop had some. Now it has been displaced by synthetic product. So unless you know a local beekeeper, you are sol. So, resigned, I went to Amazon. It had a trove of listing for "100% natural beeswax". Turns out, ALL of them are paraffin dyed to look like beeswax. You can report it to Amazon, they don't care. They will reimburse you, but never remove the listing.