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* secrets and spies *
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* Information about German espionage methods from MI5 interviews with Sergueiew, November 1943 *
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* (Catalogue reference: KV 2/464) *
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* Third Method
4. For the other method shown her by DELIDAISE, SERGUEIEW was to take what looked like an indelible copying pencil and with it scribble on a sheet of paper so that one side of it was completely covered. This sheet of paper was then used as a carbon. It apparently left no trace on the sheet of paper underneath.

5. Yvonne DELIDAISE took away SERGUEIEW’s experiments in both these methods of secret writing, saying that she would have them developed. SERGUEIEW, however, never saw the results and can give no more information.
Fourth Method
6. The final method of secret writing in which SERGUEIEW was instructed was that given her for her mission to this country. For this she was to use the pellets given her by KLIEMANN before her departure from Paris (see para.112 1st Report). She was instructed in their use in the flat at 29 Avenue de l’Opera (see para.109 1st Report).

7. A pellet was to be heated in a clear flame which would not discolour it. When the pellet was melted she was to take a wooden toothpick and dip it in the liquid. When it was dry she would re-dip it and continue doing so until all the liquid had been absorbed and a new pellet reformed on the end of the stick. This could now be used as [a] pen for her secret writing. She would then take a sheet of paper (non-shiny surface) and rub the paper evenly with cotton-wool. On the side she rubbed she was to write her cover letter in ink or pencil, preferably the former. Her letter in invisible writing was then to be written on the same side of the paper but at right angles to the visible text. If SERGUEIEW used a double sheet which entailed 4 written sides, the invisible writing was only to be done on the first and third pages.

8. Her cover letter was to be signed “SOLANGE”. It was left to her as to whether she made use of the code for her invisible writing, but this was considered unnecessary.

 

 

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