this is another continuation of the previous posts "IDEA: tamper proof mail self destructive envelope - Method 1 and ". This method proposes the use of chemical keying a dye in the envelop that will stain the document and make it unusable.
The dye will be situated between two sheets inbetween the outer and inner shell of the envelop and will flow stain the document when the inner shell is broken. Ideally, the inner shell should be decomposing rapidly to allow more stain to enter once it starts flowing. Perhaps an agent with the document will accelerate this.To disarm the envelop, the dye has a coagulation agent that the receiver can use to solidify the dye and then open the envelope. This coagulation agent should be coded to the individual and as unique as possible. Therefore avoiding another person to open the envelope by accident. In the far future this could even be based on DNA or other biometrical measures.
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