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Question by kuttu
Submitted on 7/20/2003
Related FAQ: Sci.chem FAQ - Part 1 of 7
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I am planning to do Invisible ink experiment  for the science exhibition. Invisible ink was made by mixing half teaspoon of sodium bicarbonate with 30 ml of water. Now write something on a plain paper with this ink. Let it dry. Paper looks plain like before. Paint the paper with purple grape juice. Now you can read what you have written in the paper. Which acid is present in Grape juice. What is the Chemical reaction taking place here.

 
 

Answer by Jen
Submitted on 10/6/2003
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I do not know the answer, but could someone email me back the answer so that I would know what to write for my own science experiment? Thanks! This would be very much appreciated!!

 

Answer by shella
Submitted on 10/24/2003
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tartaric acid

 

Answer by Mr Ink
Submitted on 12/1/2003
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Check out www.blacklightworld.com for all your answers.

 

Answer by rean
Submitted on 12/2/2003
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I need more info on invisible ink and I need it fast

 

Answer by Gemme
Submitted on 12/2/2003
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There is none! It's a trick question! *

 

Answer by rean
Submitted on 12/4/2003
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  I need info really badly on invisible ink so can someone give it to me please

 

Answer by linx224
Submitted on 1/6/2004
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i also need the answer and fast with any other informaction you can give for my science fair. what do you think of vegetable oil, liqued bleach, and cornstarch? please, please, please help me!!!!

 

Answer by Tiffany
Submitted on 1/10/2004
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I tried it on milk, vinegar,lemon juice, and candle wax and it worked

 

Answer by mary
Submitted on 1/19/2004
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I've been using lemon juice, that works well.

 

Answer by bloody_ninja
Submitted on 1/25/2004
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I tried it on milk, vinegar,lemon juice, and candle wax and it worked. lax works. also u can use a blacklight

 

Answer by WHITIKER
Submitted on 2/10/2004
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I TRIED ALOT OF THINGS, BUT LEMON JUICE WORKED BEST FOR ME. IF YOU ARE WANTING TO DO THIS FOR THE SCIENCE FAIR,THAT WOULD BE WHAT I WOULD SUGGEST. HOPE IT GO' S WELL FOR YOU, AND YOU WIN!

 

Answer by lacey
Submitted on 2/10/2004
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mix 1/4 cup of baking soda and 1/4 cup of water together and use a cotton swab or a painting brush and write your secret message. let the message dry completely or this wont work. then, paint over your message using grape juice concentrate and you will see the message! happy coding!!!!
:-)

 

Answer by tina
Submitted on 6/21/2004
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it's erosion of the chemical on the paper which allows the purple juice to seep through.

 

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