what i know only T stand for Tyrosinase..and T+ is the presence of enzyme tryosinase which catalyze the production of melanin or black pigment.so even they are albino,they stil have black(ish) pigment like grey and others..even the color of the eye also not red and white like T- albino..so T- is the absence of tyrosinase enzyme which make them lack of melanin or black pigment..
The reason why T+ is much more cheaper,maybe they were discovered first..and T- after that and not many people still not having them..LOL.
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