Encara no tenim significats per a "secret ink".
1The powder is shaving talcum with the secret ink ingredient mixed in it.
2I'm sure you know all about secret ink.'
3About secret ink he tells us:
4There is enclosed a bottle of secret ink powder which you requested in connection with your North Africa-Near East operation.
5These authors frequently allude to their use of red, black and secret inks.
6'I thought I'd at least learn some interesting gadgets, like using secret ink.
7" Secret ink?" Viv said, peering at the memo.
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