The formulation for Black v4 is identical to that of Black v3, and the main difference is a change in the supplier for one of the components. You can learn more about some of the recent resin reformulations in this thread.
The formulation for Black v4 is identical to that of Black v3, and the main difference is a change in the supplier for one of the components. You can learn more about some of the recent resin reformulations in this thread.