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CIA
@CIA
Secret Writing: CIA’s Oldest Classified Documents
1.usa.gov/1Tgxkeu
#SpyInk
#HISTINT ImageImageImage
Docs, released 5 yrs ago to @USNatArchives, are believed to be the last remaining classified documents from the #WWI era.
#SpyInk
#HISTINT
Chemicals & techniques for certain types of secret writing ink:
1.usa.gov/1NDfBl0 (PDF 427 KB)
#SpyInk
#HISTINT
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#WWI #SpyInk #HISTINT

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