Could be that many of the preps that you are looking at are made by the same company. Many are.
Personally, we offer two internals - our Pink Panther is red (and has been since 1989,) and our Medium Rare is light pink (and can also be offered with out the dye.)
Our outside two preps are gray (Black Bite 2.0) and gold (Monster Bite.)
The only one that doesn't get dye is the Black Bite 2.0.
It's just a way to identify them (especially as labels get ruined or the prep gets repackaged.)
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Thanks and God bless,
Brian Carlson
Carlson Racing Engines
Vector Cut
z
www.CarlsonMotorsports.com
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33 years of service to the karting industry ~ 1Cor 9:24
Linden, IN
765-339-4407
bcarlson@CarlsonMotorsports.com