John, my Mandarins are probably like yours and most of the others on this forum. I've looked at most of them. I got mine from B. Gillingham, who was one of the first to produce them. Most of these early ones are all the same type, which I call the common Mandarin. But like most wide-ranging species, there is considerable variability in the color/pattern. I think the best have a light gray background, with very little red tipping, and a nice consistent pattern. I've seen some really bad ones too. Here's an example of one of my adults...

I think quite a few of us Asian ratsnake hobbyists are looking for some of the rarer Mandarins. I've been holding out until I could find some true representatives of the alternative forms, which show the local variation, like the Sichuans, the N. Vietnamese, or the Taiwans. Right now there may be a few people working with the Sichuans, but I haven't heard of anyone working with the others. Schulz showed a pic of a Vietnamese mandarina in his monograph that was awesome, but I have yet to see one in the U.S.
Keep in touch with us on this so we can work as a group and share info. Thanks....TC.
I'm looking for info from others who have worked with mandarins. I've noticed that mandarins seem to darken with age. With this in mind, I was interested to find out if any particular locale or captive bred strain tends to start and remain consistently lighter. I have seen photos of mandarins from the Sichuan area that seem to have brighter yellow and less of the red tipping on the gray ground color. Do these animals end up lighter than other locales? I currently have a pair of captive bred mandarins that have a nice look but I think they have definitely gotten redder as they've grown. If you are interested in the same look in mandarins and have any info (or even if you just want to commiserate) feel free to post a message or e-mail me. Appreciate any input (especially photos of older adults that remained light).
John