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Resultant color step indicator

  • US 3,957,436 A
  • Filed: 04/29/1974
  • Issued: 05/18/1976
  • Est. Priority Date: 04/29/1974
  • Status: Expired due to Term
First Claim
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1. In a chemical process wherein a plurality of substances are to be mixed with a test substance in a sequence of discrete steps, the improvement comprising:

  • color coding 2 or more of the plurality of substances, each with a different inert color; and

    sequentially mixing each of the plurality of substances with the test substance and any substances mixed with the test substance in previous steps, so that the addition of each color coded substance is effective to change the cumulative color of the previously mixed substances in an identifiable manner whereby the resultant color of the mixture after each addition of a color coded substance is a conclusive indication that the step of adding the color coded substance has been completed.

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