Mark Tudor wrote: For example, any heavy metals or carcinogens in the inks or binders for cardboard or paper? Do we really know for sure? .
I looked into cardboard for sheetmulching I found that all the cardboard from North America and Europe used only vegetable inks. I wasn't sure about Asian sourced cardboard, but I think that they have to use veg ink for our markets, but it's smart to double check for your own piece of mind.