Russ,
The india ink will run when it hits the formalin and drying would mean
allowing the specimen to sit out of fixative. However, you do not have
to use Bouin's, vinegar will do the same thing.
Mequita Praet

RUSS ALLISON wrote:

> Why use acetic acid (or Bouin's) once margins have been marked with
> Indian Ink?  Is it not enough just to dry?
>
> Puzzled in Wales
>
> Russ Allison, Wales