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What is the central idea of the passage?
– Invisible ink isn’t really invisible at all.
– Lemon juice is the earliest form of invisible ink.
– British agents used invisible ink to send secret messages.
The central idea of the passage is that invisible ink, which includes substances like lemon juice, has been historically used for secret communication, particularly by British agents. This highlights the concept that what is deemed “invisible” can still hold significant value and function in conveying hidden messages.
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