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Yeah, as mentioned in one of the later encounters, there is something there, that the alchemist has, that lets the PCs use the scales to make potions of Resist Energy (acid in the case of both the green and black scales) appropriate to the type of dragon scale used.
By the way, IIRC, there were only 6 or 7 green scales, and 1 large black scale, in the treasure. I could be mis-remembering, my players are just about to experience the auction at the beginning of Chapter 3...
The amusing thing 9os that my players identified the black scale, but are not sure what the green scales are. They are, currently, assuming they are also dragon scales, but they are taking a shot in the dark on that.