You will need 2 teabags and 6 iron tablets (the kind you get from health food shops - a form of Iron
- Brew the tea for 1/2 hour in 250 mL of boiling
- While you wait for the tea to brew, dissolve the 6 iron tablets in 2 teaspoons of hot
- After the tea has brewed, pour in the iron solution (leave the undissolved bits
behind); note the fizzing. A chemical reaction has occurred!.
- Leave overnight.
You have just formed Iron Tannate from the tannic
acid in tea!
Use a paint brush to paint a message on a peice of
paper. If you have an old nib pen, try out your ink to see how well it
works. Your ink may damage the metal as nib as it is likely to be
Iron tannate ink was called ‘iron gall’ ink, used in Europe from about the 11th Century onward.
Today, modern pens use alternative inks as the acid in our iron tannate ink damages the paper it is on.
FIND OUT MORE:-
- Secret Agents might like to try our Invisible Ink...
- Test this ink and compare it to the ink you can buy
from the shops.
- Find out more about how people first kept records
(stone tablets, papyrus, cloth, etc)
- Did they use the same languages, or symbols (what
are runes, hieroglyphics, etc)?
- The interactive pages...identify these pieces of lab
- The interactive pages...weird metals and gases hide
in this Periodic Table