we would have loved to pass on to you the recipe for invisible
used by secret agents during the Revolutionary War, the CIA has locked
that recipe away in its vaults and does not want it shared. If
type “invisble ink” on your search engine, you will
find many recipes and many stories about its uses throughout the
but no recipe that Silas Deane may have used. Maybe time will change
this policy. Let us know.
Benjamin Franklin letter