Hello,

You can find about this exhibit in Exploratorium's Cookbook I, page
43-1. It is called Horse's Tail. It is said in the construction
instructions that a graduated material called Letraset(TM) Pantone(R)
Color Paper, graduated, uncoated, 404U-G, can be be used.

Hope this helps.

Ali Parsa
Director
Zirakzadeh Science Foundation
Tehran, Iran



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