Originally posted by KazetNagorraYou never write secret mesages in onion juice when you were a kid?
To answer your questions: yes, no and such a definition of ink is contradictory (an ink, by definition, leaves some kind of trace, otherwise it's useless as an ink).
Invisible
Until you heat it over a candle.
Onions and candles ... amongst my favourite toys
along with a stick and hoop of course ......................................
Originally posted by wolfgang59I didn't, and I wasn't aware of any "invisible ink" until recently. (though that kind of ink is not invisible in a strict sense of course)
You never write secret mesages in onion juice when you were a kid?
Invisible
Until you heat it over a candle.
Onions and candles ... amongst my favourite toys
along with a stick and hoop of course ......................................
Originally posted by KazetNagorraChatting with a friend; and apparently lemon juice works well too (and is infinitely easier to squeeze!)
I didn't, and I wasn't aware of any "invisible ink" until recently. (though that kind of ink is not invisible in a strict sense of course)
Enid Blyton had her heroes use orange juice (though one would imagine that not to be so invisibele?)
