I am planning to do Invisible ink experiment for the...

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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.

Answer by Natalie
Submitted on 1/4/2005
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i want to know ALL about invisible ink, and how to make it =)

Answer by Bitter_Lemon
Submitted on 2/23/2005
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the juice of lemons has compounds of carbon. these compounds have almost no colour when you dissolve them in water. when you heat them, the carbon compounds break down and turn black.

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Answer by Da
Submitted on 3/7/2005
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i used soda and more soda

Answer by clg
Submitted on 3/16/2005
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We have been using lemon juice concentrate and not getting the results described ... no black carbonizing on the paper when held near a light bulb. Anyone no why ? We have the science fair tomorrow ... got an idea please respond. Thanks

Answer by aneseh
Submitted on 3/6/2006
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how to make invisible ink?

Answer by gog
Submitted on 8/7/2006
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Try www.goodscienceexperements.com for the anser

Answer by real madrid
Submitted on 3/1/2007
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I am stuck to so don't ask me

Answer by Me too!!
Submitted on 3/29/2007
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I used lime juice and it really worked. Orange juice worked really good too. I did not hear of using UV lights how do you do that experiment?

Answer by aus
Submitted on 4/2/2007
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ummmm tartaric acid is in grape juice

Answer by lil
Submitted on 4/30/2007
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i think it an acid base

Answer by mau
Submitted on 7/13/2007
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what the heck are u talking about?