I contacted the companies that send outmultipage junk mail every week and asked them if they used heavy metal based inks. I figure that contaminates that are organic (in chemistry terms) can be broken down in the composting / mulching process but heavy metals which are common indyes will build up and enter the food chain. One company got back to me with a positive tick so I use tjere stuff, the rest go into the paper recycling.
Down here in NZ we have issues with conventional farms having put so much super phosphate fertiliser on the dairy farms that we can't use blood and bone in organic systems as there is high cadmium that is in the cattle bones from the cadmium build up in the pasture from the super phosphate. Disturbingly there is now a deposition layer in local lakes that is high in cadmium. So hence I get a bit paranoid about heavy metal accumulation.
