Spies and Secret Writing

Iodite of potassium, sulphate of iron, nitrate of silver, rice starch, ferro cyanite of potassium, and even lemon juice. These are some of the ingredients necessary to reproduce the secret writing techniques described in the six documents declassified by the CIA last week as part of the work of the National Declassification Center (NDC). The … Continue reading Spies and Secret Writing