Using Pencil to Make Marks on Fabric - Does Graphite Affect the Vat?

Q: I am interested in using some stitched techniques to create patterns on my pieces.  Everything I read tells me to use tailor's chalk or a disappearing water soluble fabric marker to plan out designs on my pieces, but I have been using pencil.  Will the lead from my pencil affect my vat?

A: Graphite will not harm your vat but it is very challenging to remove from fabric so chalk is definitely better.