BEEF, Here's what I recall about Dyoderm and its usage.
Feel free to correct me where and if I'm incorrect.
Dyoderm (or however it is correctly spelled) was originally a product developed for and used by morticians in an effort to make cadavers (dead guys in open caskets) look more pleasant.
And if I am not mistaken ... it was Jeff Everson who 'packaged' the product for bodybuilders to make them look more 'pleasant".
I believe that I was one of the first retailers of that stuff.
Once applied ... it smelled pretty bad and if I recall correctly .... it often resulted in a greenish tint to the body of some who used it.
It was pretty damn successful at that time but then other and better 'browning' agents appeared within the bodybuilding market and Dyoderm died a slow death similar to those cadavers who used it originally.
It's possibly still used by the young guns who frequent the shores of Jersey City and it's night spots.
And as you most likely know ... frequent sunbathing is a common cause of skin cancer.
NOTE: Then these 'browning agents' caused additional problems which had to be solved ... and I believe ... eventually were.
More on that if interested....... And other shit that you may not be aware !