Color changeable dyes for indicating exposure, methods of making and using such dyes and apparatuses incorporating such dyes
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United States of America Patent
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Nov 8, 2016
Grant Date -
May 15, 2014
app pub date -
Jan 22, 2014
filing date -
Dec 9, 2011
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Abstract
According to embodiments of the present application, a color changeable dye can comprise a redox indicator, a reduction reaction initiator, an electron donor, an oxygen scavenger, an indicator barrier agent, a thickening agent and an agent to facilitate mixing. The color changeable dye is a first color in the presence of oxygen, capable of changing to a second color upon reduction in a substantially oxygen free environment, and capable of changing back to the first color after exposure to oxygen for a period of time corresponding to the intended use time of a disposable or limited use product. Methods of making and using the color changeable dye and apparatuses incorporating such dye are also disclosed.
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