Is it possible to make homemade ink for a fountain pen?

Question

if so, ingredients please.

Answer 1

I  think  I  saw  this  in  a  movie.  It  was made with  black  grapes, fruit ,  maby blackberry  squeezed  and  strained.

Answer 2

y do u wanna do that?

Answer 3

Yes, I've done it.  I don't remember for sure the specifics, but probably ferric ammonium sulfate and potassium (or sodium) ferrocyanide.  But you risk corroding or clogging your pen, and some of the materials (recognize cyanide?) are poisonous.