I have a booklet published in 1946 by Dupont called "Dupont defender formula book" while it does not have the formula for 777 it does have a p-phenylene diamine/glycin formula called defender 5-D. If anybody wants it I will post it here.
I have a booklet published in 1946 by Dupont called "Dupont defender formula book" while it does not have the formula for 777 it does have a p-phenylene diamine/glycin formula called defender 5-D. If anybody wants it I will post it here.