Having started work (many decades ago) as the toxicology/chemical information specialist for a leading consumer products company, packaging materials and labeling/printing were a frequent concern. Unlike you, I have no faith at all in the lack of toxicity of the cardboard, paper and inks involved here; and I'd assume your soil has some contaminants.
With the pizza boxes I'd presume only the inner contact layer is food grade (and the standards for these types indirect additive coatings are rather weak). Soy-based printing inks cost more and take longer to dry, with synthetics presumed used for the cheap printing on the box. Other than the more expensive soy and other eco-friendly printing inks they have now, I know of no printing inks that are food grade, they are all rather nasty complex mixtures, and I know of no actually non-toxic red inks. Unless the pizza box includes a printed note stating food grade ('non-toxic') inks were used (need to claim some credit for this added cost), I'd presume the inks are synthetics (often containing known or suspect carcinogens) and the cardboard is standard cheap cardboard with all its additives. Similarly, unless you know the newspaper is printed with a 'non-toxic' ink or from an area likely to demand this, I'd presume otherwise. For ex., I know my local paper (Washington Post) claims to use non-toxic inks and paper, but outside of such upscale, woke, etc. areas I'd presume the newspapers use standard nasty inks and paper.
Your goal is "absolutely no chemicals in the materials I use," but be aware that there are surely some detectable ink, newsprint, paper and cardboard-derived "chemicals" in your soil. While I'd have no concerns about toxic effects from consuming weed grown in soil from worms having eaten some newsprint and cardboard (I'd welcome consuming what looks like exemplary weed you grow), by some peoples' standards your soil is contaminated, not 'organic.'
With the pizza boxes I'd presume only the inner contact layer is food grade (and the standards for these types indirect additive coatings are rather weak). Soy-based printing inks cost more and take longer to dry, with synthetics presumed used for the cheap printing on the box. Other than the more expensive soy and other eco-friendly printing inks they have now, I know of no printing inks that are food grade, they are all rather nasty complex mixtures, and I know of no actually non-toxic red inks. Unless the pizza box includes a printed note stating food grade ('non-toxic') inks were used (need to claim some credit for this added cost), I'd presume the inks are synthetics (often containing known or suspect carcinogens) and the cardboard is standard cheap cardboard with all its additives. Similarly, unless you know the newspaper is printed with a 'non-toxic' ink or from an area likely to demand this, I'd presume otherwise. For ex., I know my local paper (Washington Post) claims to use non-toxic inks and paper, but outside of such upscale, woke, etc. areas I'd presume the newspapers use standard nasty inks and paper.
Your goal is "absolutely no chemicals in the materials I use," but be aware that there are surely some detectable ink, newsprint, paper and cardboard-derived "chemicals" in your soil. While I'd have no concerns about toxic effects from consuming weed grown in soil from worms having eaten some newsprint and cardboard (I'd welcome consuming what looks like exemplary weed you grow), by some peoples' standards your soil is contaminated, not 'organic.'
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