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A.G. from Iraq for now :o(    Sunday December 05, 2010 Asked this Question:
Subject: OTR design Markers
Question: Whats the difference between the OTR .830 and .840? I got the .830's already, they are straight, I used to use the Chartpak AD Markers, are the .840's like them?
AP Reply: They are similar to shartpacks no difference that you would likely notice. They are both alcohol based Sketchbook markers. One uses natural alcohol (ethanol) one uses synthetic (denatured alcohol)
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