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You can find ink sacs by killing squids in Minecraft. They can also be found as junk items in fishing.
Ink Sacs can be used to dye anything that has colour variants - leather armour, blocks of clay, blocks of wool and stained glass windows.
You can't write on paper on Minecraft. However, you can write in books by adding an ink sac and a feather to them.
If you have the recipe book mod installed, you craft it with 1 ink sac and 1 book.
In Minecraft 1.3.1, they added the book & quill item that lets you write and edit a book in Minecraft vanilla. If you combine a book (gotten from 3 papers and a leather) with a feather (dropped by chickens when killed) and an ink sac (dropped from squid when killed), you will get a book & quill that you can write in. You're welcome for the info!