Titanium White (PW 6) vs Titanium - Zinc White (PW 6, PW 4)

RonLo83

I noticed that most manufacturers use a combination of titanium and zinc for their white but Geneva uses only titanium white (PW 6). Is their an advantage of using a white paint that only has (PW 6)?

Summer

It's my understand that paints made with zinc oxide and drying oils become very brittle in just a few years--I believe as little as three. 

RonLo83

Does titanium white have a higher tinting strength than titanium with zinc?

Summer

Yes, titanium oxide is much brighter than zinc oxide and also more expensive. 

RonLo83

Perhaps that is the reason for manufacturers adding zinc to their white. Expense. Although I know Gamblin and Michael Harding make a white that only is titanium oxide but they are priced the same as titanium-zinc white.