I find this particular one quite interesting as it has a reverse coloration at the midrib giving the shade appears like the water color effect at the center except at the midrib and the perimeter of the foliage.
These need bright direct Sun Area (they can survive in shade area but will loose the black coloration)
They needed grown on direct sun with a swampy condition - loves wet feet conditions.
The foliage appears to be waterproof with watercolor painting like dark plum coloration except at midrib and leaf perimeter edges. Also the stem has dark burgundy coloration.
Plant Care & Cultivation is very much similar like most of the Colocasia species.
UPDATED JUNE 2020
I had totally lost this particular plant - it when slowly into dormancy when all the leaves started to dry and wither away one by one - I believe it was because it was inside my garden and the lack of bright direct sunlight didn't help much either.
I had slowly re-positioned it in front my porch area where there is much light in comparison to where it was earlier - but then, it didn't help much until everything was gone.
Then I noticed new sprouts started appearing from the medium that I used earlier from a different pot and more plant-lets sprouted out - I dare not do anything until they have grown well for me to replant & transfer as I had done for my "Black Magic" Colocasia plant
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For Detailed information of Care & Cultivation of Colocasias &
For Other Different Types of Colocasia: