Interesting, the ULSD distributed in Alaska is sold without dye. Off-road fuel is clear. The explanation I heard is there is not enough storage to keep it separate. With the new IMO standards, even the marine industry has switched to 15ppm ULSD, which will make fuel prices on the coast rise as we head into 2020.
Also, I was under the impression that all the diesel #2 and diesel #1/ Jet-A/ home heat oil was ULSD (less than 15 ppm sulfur). But, I know two distributors in SE Alaska selling #1 home heat oil with 350 ppm sulfur. I didn't think you could source that from a North American rack. Turns out, much of the fuel being distributed in SE is Alaska is coming from the Singapore Rack.