solid purple roots
 

hello all im new to the forms and i would call my self a novice to the hobby. i have a Renanthera 'john losgar' (imshootlana x citrina) that as developed purple roots, not just the tips, but the whole roots themselves have turned purple. ive had it for about 3 months now potted in a mix of orchid bark,sphagnum moss, and charcoal in a clear plastic pot (of course with ventilation slits on the sides and bottom). It was previously potted in gravel.
Can anyone help me guess whats wrong with it? im hoping the roots are just dying becuase of the change of environment/media, but im also scared its a fungal/ virus infection. There are new roots growing however that seem to be perfectly fine. they are not purple whatsoever.

I think it should be fine.

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should i cut the purple ones off so it doesnt spoil the media?

Welcome to the Orchid Board!

A lot of plants in the Vanda alliance, like Renanthera, develop purple roots in good light. It's a good sign, because they grow and flower best in strong light. Don't cut them off.

Purple in leaves/roots is related with levels of a pigment called anthocyanin. When light levels increase scientists say its levels increase to protect the leaves from being damaged. Think of it as the same process that occurs with humans when tanning.

Also, when this coloration is obvious it means the flowers have purple/red among their colors.

See this video.