Which are "greener" -- crayons or markers?
March 19, 2009
http://www.seventhgeneration.com/learn/ask-science-man/question-capecodgirl-0
The answer to your question depends on how you define “green,” and on the composition of the specific crayon or marker being considered. Most crayons are made from paraffin wax and pigment and have a paper label affixed with glue made of cornstarch and water.[1] Paraffin is a petroleum byproduct and paraffin wax crayons are not biodegradable. A more environmentally friendly alternative to traditional crayons are soy oil based crayons which are plant-derived and 100% biodegradable. [3-4] Markers are divided into 3 main categories: water-based, alcohol-based, and aromatic solvent-based. Water-based markers are the least toxic, followed by alcohol-based, although alcohol-based markers do contain toxins. Aromatic solvent-based markers are the most toxic and many contain xylene, a chemical that is a neuro-, kidney-, reproductive-, and respiratory toxin.[1]
To read the full article:
http://www.seventhgeneration.com/learn/ask-science-man/question-capecodgirl-0
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