this is a continuation of the "IDEA: tamper proof mail self destructive envelope - Method 1" post. In the last method, the destruction of the ink was used to ensure the document is destroyed when the envelop was opened without proper authorisation.
Another method is to use special paper, such a photo paper which interacts with the environment when opening the envelop improperly. For example the photo paper will be exposed to normal light when opening an envelope without dark room. However, this mechanism will only protect the content from unintentional opening. Parties familiar with the process can open the envelop in any darkroom and gain access to the content.
A more suitable means would be to key the paper chemically in a unique way -- such as using a photo paper which is save only in a specific wave length using filter paper. A person in a dark room needs to have a particular light source to expose the paper for it not to expose. Therefore the paper can be tuned towards a specific recipient.The self destructive paper system could be combined with my previous method in a way that the envelope contains a small destructive light source such as LEDs or a flash light that exposes the content upon opening without authorisation.
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