First I will say that hets should not be bought based on markers or lack there of but on the seller's reputation.
Now I can also tell you that I can and have successfully pick out hets out of clutches that were considered 50% or 66% hets.
Markers are more then the presence of train tracks which in some mutations tend to disappear anyway.
Some animals do not present themselves with the those train tracks yet they are hets.
Bottom line buy from a reputable breeder and if you produce PH once you get a trained eye you will be able to tell them apart.
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