It is yellow colored.
You can do worse than the Gold though. If automotive or universal coolant was added to your system (inadvertantly, innocently, erroneously, mistakenly) this is worse than BAD as it will interact almost immediately and inevitably lead to a gel formation - not necessarily silicate based. It is a chemical reaction that can't be reversed though. The effects can be mitigated but not undone easily.
This is what happened to me...
I lost my lower radiator hose due to a pin-hole leak (it was rubbing on the steering linkage after some off-road adventuring). The leak became obvious when I was visiting my grandmother for her 90th birthday. I was able to get a replacement hose but unable to get a service appointment (the birthday party was much more important and I was away from home by several hours). I had my parents' "trusted" auto shop provide the labor - they were not happy that I already had the part but assured me they would use the proper coolant...for them this was green universal automotive coolant ("It's universal isn't it?" They noted afterwards...my mistake for not also providing a diesel engine compliant coolant). Anyway, my oil cooler eventually plugged despite a flush (15 of them).
Anyway, Premium Gold isn't crap but there are alternative products that have improved capabilities and lifespan (and costs more - although the longer life offsets the initial cost to be sure...maybe there are even sites to get the ELC at a reduced price, I don't know).
As to a FOR SURE test of the manufacturer of a coolant - I don't think it is possible even with spectroanalysis. You could tell if it were a coolant with SCAs possibly...
In all likelihood if you have a truck under 100k miles with an OASIS report available and the coolant is yellow, you probably have Premium Gold.