Is newspaper toxic for your organic garden?

I have never given a great deal of thought before to using black and white newspapers in the veg patch having seen Peter Cundall and others use it before. However I am not so sure after reading another blog found here.

http://cityfoodgrowers.com.au/blog-latestposts.php?catid=104

interesting points are as follows:

What is the newspaper process?

Newspaper is made from paper which comes from wood. When the paper is created, chlorine is used to prepare the pulped wood so it can be made into paper and then bleach (made predominantly from chlorine) is used to dye the paper to a whiter level.

Newspaper ink was initially all based on petro-chemical substances and over the last 30 years, printers have moved towards more vegetable based inks, with soy being the most common ingredient. Soy based inks are predominantly derived from genetically modified soy crops.

Petro-chemical inks are highly toxic to the environment, whilst vegetable based inks are not so toxic and more biodegradable. Newspapers normally use a combination of petro-chemical and vegetable inks. The proportion of use may depend on how environmentally friendly the paper owner chooses to be as vegetable based inks are more expensive than petro-chemical inks.

The newspaper inks have pigments in them to create the print colour. The most common pigments are based on petro-chemical substances. These pigments combine with the ink to produce the black and colour print

What are the risks?

Each of the risks below impact the primary task of the successful organic gardener and that is to promote and protect life in the soil. Such impacts will lead to lower seed fertility, weaker plants, greater infestations of pests and diseases and lower life force in the plants which results in lower nutritional value and poorer taste:

Chlorine toxic impact:

1. Toxic breakdown – When chlorine dissipates after use, two of its by-products are dioxin and organo-chlorides and these substances do not break down easily, they bio-accumulate, which means that any chlorine left in the newspaper you use in your “organic” garden will leave these two toxic substances in very small quantities in the garden and the atmosphere around the garden. Dioxin is known as the most toxic chemical on earth.
2. Stops micro-organisms – Chlorine and bleach are incredibly effective at killing micro-organisms, just think how you may use bleach at home. In a compost heap or in your garden beds, one of your main tasks is to encourage the proliferation of life via micro-organisms, so anything you put into the garden to slow this down makes it more difficult to have healthy soil.

Ink toxic impact:

1. Heavy metals from petro-chemical ink – Its quite likely that the newspapers you use for your garden have a mixture of petro-chemical and soy based ink.  When released into the atmosphere, petro-chemicals can contaminate soil and groundwater. 
2. Support of GM products in soy ink – Usage of GM products is very contentious with the proponents believing it’s the saviour of our ailing food system and it has no adverse affects on the environment. If you don't support GM products and prefer to be more cautious with the avoiding the potential impacts of GM products residues in your soil, then avoid newspaper produced with GM soy ink

Pigment toxic impact:

1. Heavy metals in pigments – Common inorganic harmful substances used are Cadmium for yellow, Phthalocyanine for blue and with black ink; the carbon used for such inks is often produced with petro-chemical oils. 
2. Combination of ink and pigment – As indicated above, the potential for toxic substances in newspaper is very high, given the process of production. These substances, when combined together and whilst breaking down in your soil, may result in other harmful substances.