Cartridges contained polyethaline glycol when they first were introduced to the market. (at least that's what I was told at the time)
That's a wood preservative. Fills pores in wood with a water resistant material to prevent it from degrading. Also a primary ingredient in anti-freeze.
Seems strangely consistent with the symptoms which are presenting.
How did any of this make it to market in the first place?
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