Before:
After:
This is a typical construction framing square that has been left in the back of his truck for all spring and summer. It was placed into a 10% solution of Enviro-Safe and left of a few hours.
When the square was removed from the rust remover, it was noticed that it had the number engravings for the measurement. The engravings were painted so the numbers can be read easier. The rust has been dissolved off the part and the paint was totally unharmed. The square is completely usable