[CuriouslyC]

The microbes and fungi in the soil act as remediators for most organic compounds. Shouldn't be an issue, but you can always grow perennials in the bed that take time to grow rather than fast growing annuals if you're concerned.

[TuringNYC]

I came here with the same question -- the ink. Why do you feel that the ink is an organic compound? Not sure if there is an easy answer here but this site: https://home.howstuffworks.com/pen4.htm seems to suggest colored inks are inorganic and contains heavy metals.

[CuriouslyC]

The thing is that there is a lot of variation in ink composition, so it's hard to say universally. That being said, fungi tend to sequester heavy metals in their mycelium, see https://krishisanskriti.org/vol_image/03Jul201502072615.pdf

[dexwiz]

But if you just compost the fungi, you are just back to where you started. With phytoextraction you have to incinerate the plant material afterwards. I know fungi aren’t plants, but similar principle.

[CuriouslyC]

You can harvest the mushrooms and throw them away.

[dexwiz]

The fruiting body of a mushroom often represents only a fraction of total biomass. It depends on the species, but what we see above ground is more analogous to a flower than an entire plant.