Visual indicator system
First Claim
1. A colorimetric indicator system to warn of tempering in a sealed package comprising (a) an oxygen-sensitive compound and (b) a separate color indicator which (i) will change color in response to an interaction between oxygen and the oxygen-sensitive compound and (ii) will not change color in direct response to oxygen.
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Accused Products
Abstract
Packages which are subject to tampering while in a store or deterioration over time due to the presence of oxygen may be readily identified by placing therein a multi-component visual indicator system which is sensitive to the presence of oxygen. The system, which may be prepared aerobically and then placed into an anaerobic environment for use, is not effected by the presence of reducing agents found commonly in foods, drugs, and cosmetics.
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Citations
22 Claims
- 1. A colorimetric indicator system to warn of tempering in a sealed package comprising (a) an oxygen-sensitive compound and (b) a separate color indicator which (i) will change color in response to an interaction between oxygen and the oxygen-sensitive compound and (ii) will not change color in direct response to oxygen.
Specification