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From time to time I see on different papers "Printed with eco-friendly ink," so I assume that it is the soy-based ink. I have read a bit about it, and the opinions about soy-ink being eco-friendly are split, but I would say that it's definitely better than oil-based, as it contains less volatile substances.

Then I wanted to buy one for my printer and... surprise! I cannot really find a trustworthy website (in my opinion) where one can buy it. Now my question is... Why? Why don't we see an abundance of such eco-friendly solutions? And where do the manufacturers of eco-friendly printouts find it? Or is it just a marketing text without any cover? Is there any label that can vouch for that?

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    one reason may be that soy-ink is more expensive and most people aren't willing to pay the cost difference. It may also be that it requires special equipment for printing. Perhaps you should update your question with the specifics of your printer such as what kind it is, model number and manufacturer, etc. – Richard Chambers Dec 14 '17 at 5:15
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tl;dr: A lot of soy ink is used, but mixed with petroleum-based ink.


According to Wikipedia:

A major problem with soy ink is that it takes more time to dry than petroleum-based inks, due to its lack of evaporative solvents in the form of VOCs.

"VOCs" are Volatile Organic Compounds -- organic in the chemistry sense, not the farming-process sense.

This drying problem means that the use of soy ink is limited to purpose-made printers and/or papers.

While VOCs can be both synthetic or natural, the synthetic variety are associated with long-term health risks, air quality problems, and carbon emissions. So adding synthetic VOCs to soy-based inks to eliminate the need for special equipment or papers would defeat the purpose.

One way around this problem is to simply produce soy ink that's only partially soy ink. The standard for what percentage of an ink must come from soybeans is set by the American Soybean Association (ASA), which authorizes the use of this seal by inks which meet the standard:

enter image description here

In the standard they publish, no ink needs to be more than 40% soy to earn the seal, and some specialized inks (such as heat-set ink) can earn the seal even with 10% soy or less.

In fact, it seems that this mixing is done across the industry. According to the same Wikipedia entry, soy ink was developed in the 1970's to hedge against rising petroleum costs. Use of soy ink (mixed with conventional ink) is widespread in the printing industry -- according to this article from 1999, at the time 90% of daily newspapers and 25% of commercial printers were using soy ink, purchased from an industry with over 100 producers.

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