Just picked up a prime engram (my second 700 one woop), and noticed i had a stack of shaders to recycle.
They were the Verdigris shader.
They gave me shards, when previously having recycled them from my inventory, they had given dust.
Proof;
https://youtu.be/maGX0F3Mki8
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I think this is due to the Five verdigris shaders you receive from Tess Everis with package from the start of the season