Last year was the first year that I produced ODs, and I was a little worried that I'd have difficulty picking them out as well. After the snakes had a couple of sheds, though, most of them were very obvious. I did produce two (out eighteen) that are a little iffy. Luckily, though, they're both females, so I'm just going to raise them up and breed them.

If you're purchasing an OD, I personally would make sure to buy it from the person who actually produced it. I've seen several snakes for sale at fairly low prices that were labeled as ODs, but were bought from someone who bought it from someone else who supposedly bought it from the breeder. I'm worried that someone might get a pretty normal instead of an OD if they're not careful.