I'm not saying that it is not possible for a Javanese wrongko to be from kemuning.
I'm sure some older wrongkos, were from kemuning, but I have never seen or handled one that people who know more than I do identified as kemuning. Over the years I have known three or four tukang wrongko very well, and a couple of tukang jejeran very well. The tukang jejeran would not infrequently mention kemuning, the tukang wrongko never did.
Kemuning is a light coloured yellowish wood. If it is dark, it has been stained, If a wood that is darkish and has the appearance of kemuning has not been stained, it is not kemuning.
There is a type of kemuning that is called "red kemuning" (kemuning bang), but its only reddish when it is freshly cut, when it dries its just as pale as any other kemuning.
Kemuning that has a nginden grain is very, very difficult to work, the nginden grain is fibrous, and it is exceptionally difficult to get a good polished finish to it, so even if there were to be a piece large enough for a wrongko, the finishing of it to wrongko standard poses a problem.
Kemuning does not look anything like trembalu, and trembalu does not look anything like akasia, even though both usually have a nginden grain.
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