In the selection “How Secret Messages Tipped the Scales”, the use of Dr. Jay’s invisible ink instead of the lemon juice method was because --
In the selection “How Secret Messages Tipped the Scales”, the use of Dr. Jay’s invisible ink instead of the lemon juice method was because --
Washington wanted to support his friend who created it.
It was easier to find than lemon juice.
No special chemicals were needed to produce it.
It was not easily recognized by British soldiers.
1 answer
It was not easily recognized by British soldiers.