The formula of invisible inks, utilized by an East-German secret by the police in order to transfer communications during the Cold War, until now, remained undeciphered.It is more than fifteen years after a drop in the Berlin Wall and reunification of East and West Germany, scientists assume that finally they found the chemical composition of these inks.
The agents of German special services brought text to the paper through the similar to the carbon paper film, impregnated with chemical substance. Message could read only that person, in which there was another liquid, which makes it possible to appear invisible letters.
A few agents even in the limits of the service of state security knew complete formula both for the writing and for the reading of secret letters from the fear that they can transmit this information to other country.
The confidential archives of German special services were declassified after a drop in the Communist regime and destruction of the Berlin Wall in 1989, but in them not there was instruction, which describes the process of invisible letter.
The historian of the Univeristy of Michigan To kraysti Makrakis and its command, in composition of which worked the chemists, via tests and errors deciphered formula. Chemical reaction was described in one of the documents, discovered in the archive, but it was incomplete. Scientists experimented with different quantities of chemicals. It turned out that pH the factor was decisive for obtaining the secret substance.
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