Education and demonstration – Question or problem eliciting response – Correctness of response indicated to examine by...
Patent
1987-04-24
1988-11-29
Apley, Richard J.
Education and demonstration
Question or problem eliciting response
Correctness of response indicated to examine by...
427145, 428 29, G09B 300, B41M 512
Patent
active
047878525
ABSTRACT:
A kit for producng symbols of unpredictable colors on paper including a plurality of individual sheets of paper each having a coating therein containing a reactant composition. A writing instrument is included in the kit to be usable with the various paper substrates supplied therein for writing thereon in various colors depending upon which reactant is contained within the coating of a particular piece of paper. The different paper substrates each will include a reactant chosen from one of several reactants used in the kit. Each of these individual reactants when contacted by the writing instrument will react with an agent in the fluid of the writing instrument to display a coloration on the paper substrate which is different from the reacted coloration resulting from usage with a different reactant. Each paper substrate has a base coloration which is in no way indicative of the particular reactant contained in the coating thereon. Thus prior to use, a user will not know what color the writing will become on different pieces of paper substrate.
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Apley Richard J.
Welsh J.
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