Artist Oscar Diez created this amazing calendar, made of different types of paper and special inks, which is carefully designed to slowly color in the days of the month by capillary action, in real time, over the course of each month. Via Boing Boing.
Posted by Sean Michael Ragan |
Jul 29, 2009 08:00 AM
Arts, Chemistry, Makers, Paper Crafts |
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In Washburn's Equation (http://en.wikipedia.org/wiki/Washburn%27s_equation) the time for a liquid to penetrate a distance L into a porous material is proportional not to L, but to L². I would expect the dye to take longer to penetrate each successive day's numerals.
The equation also includes D, average pore diameter. One way to make this work would be to vary the average pore diameter across the calendar--large at the beginning and small at the end, so that D is proportional to 1/L. You could do this with just two different porosities, changing from mostly one porosity at the start to mostly the other at the end of the calendar.
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Note that the vast majority of the calendar's area is below the reservoir of ink, meaning that there's a siphoning effect going on that makes the system more complex than Washburn's equation can model by itself.
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