To the untrained eye knowing what to look for in a marbled foot is hard to define. your photo to me is very easy to tell its not a rainbow. I know lots of cultivators for colorado sunbursts and have yet to see one with the pink tips like a rainbow. I also have yet to see anyone color shift a rainbow to not have the pink tips. Im growing a bunch of Chicago sunbursts getting them to color shift with different t5 bulb configurations and still cant get the rainbow pink tips.I find that pink tips aren't the best indicator of true lineage. The marbled foot of the colorado is pretty distinct though.
Here's a Sang Lee lineage CSB with partial pink tips.
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Here is the same CSB a couple months ago.
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They shift colors pretty easily.
very easy indicator without getting your hands wet. also most sellers online will not show photo of foot


