What is the conductivity of Play Doh?

Sparkfun and Make both have squishy circuit recipes but I'd like to know the conductivity... anyone? thanks!

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hydronics (author) 3 years ago
The conductive play doh recipe is fairly ubiquitus:
1-cup water
1-1/2 cups flour
1/4 cup salt
3 tbsp cream of tarter
1 tbsp Vegetable oil
food coloring

I measured the official play doh at 100k/170k (brown/blue color)...
What section and length of Playdoh ? RESISTIVITY is the unit we need to compare it with
hydronics (author)  steveastrouk3 years ago
based on my initial measurements it varies little based on length... i mean we're not talking about meters but inches...
It has to vary linearly with length, but by the square of the crosssection.
Steve, I think that assumes that the material has uniform conductivity everywhere (i.e., like a metal wire), which may not be a good assumption for Play-Doh.

If the conduction happens, for example, in more electrolytic "veins" between larger grains or nodules of dry dough, then I you might see subquadratic dependence (e.g., r log(r) instead of r2 for the cross-section).

True. Interesting to find out, and perhaps try graphite loaded clay !
Kiteman3 years ago
I don't think they're using normal play doh...