Answer:
James Jay created an invisible ink system that required two chemicals.
Step-by-step explanation:
According to the excerpt from “Tools of the Spymaster." it is narrated that James Jay created an invisible ink which its content on paper can only be read when another chemical is used on it. This was useful during the war to send encrypted and secure messages.
The statement includes explicit information from the excerpt is James Jay created an invisible ink system that required two chemicals.