OaklandCityFarmer said:
I know there is a bit of a debate over whether or not newspaper ink is toxic or not but from I know there are no substantial studies that show any toxicity caused from using newspaper. The chemicals used to make the ink (which are either petroleum or vegetable oil based) are found to contain little to no VOC's (volatile organic compounds), this is based on studies between 1992-2005. Furthermore, no trace chemical compounds have been found in the crops tested therefore they do not pose a threat to the food chain/system. Basically it's a matter of opinion more than anything.
I'm not trying to be difficult, but there are additions in inks, including soy ink, which remain in the soil. To my way of thinking, what's in the soil has the potential to get into at least some crops.
Too, even if they decided to use a food grade ink, (soy ink is not in any way, shape, or form edible. I mean, you can eat it, but you can also eat paint chips containing lead, too.), while a good many papers use it, not all do.
I don't know if this is current, but that last stats I read were that while 90% of daily newspapers used colored soy ink, because the price is not that different than conventional ink, only 1/3 use it for their black in, as the black soy ink is 25% more costly.
To make soy ink, soybean oil is blended with pigments, resins and waxes. It contains the same pigments found in conventional petroleum-based inks. This, and some other chemicals, is what makes soy ink not 100% biodegradable.
Also, we cannot forget the chemicals used in the manafacture of the paper itself.
Let's put it this way, f you are certified organic with CCOF, (I haven't looked into it with Oregon Tilth etc.) you
cannot have newspaper in the garden, at all. That's a guaranteed way to have your certification pulled.
So while any individual may decide that the possible risks to their food is acceptable, and decide to use it, you are, without question, putting the chemicals from the newspaper manafacture, and the ink, whatever that might be for the particular newspaper you happen to get, in the ground, which I believe was the original question. (What affect decomposed paper has on the soil.)
Sorry to sound heavy about this....I don't mean to. I just don't want to gloss over the fact that chemicals, not all desireable, are a by-product of newspapers.