Colocasia "Black Magic" - reverting?

Last summer I had a Colocasia "Black Magic" - the dark purple one that goes 
by about a hundred other names.  Fortunately, it was one of the Colocasias 
that did form a tuber and I was delighted there was a chance I'd be able to 
grow it this season without purchasing a new one.

I've now planted it and what I see coming up looks very much like a generic 
green Colocasia esculenta.  Do they commonly (or occasionally) 
revert?   Might it get darker in brighter light?  (Currently it's in my 
greenhouse but now that the trees have leafed out, it's partially shaded 
and is growing in dappled sunlight.)

             Les
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