Jarv-

Therein lies the confusion. Platinum is Potassium Chloroplatinite. Na2 is Sodium Platinum. Check the labels on your bottles to verify - there may be a typo on the B&S webpage. If you use Palladium (Sodium Chloropalladite) with Platinum (Potassium Chloroplatinite) to achieve a "platinum" look, then adding NA2 (Sodium Platinum) into the mix will be a waste of NA2. All it will do is retard your highlights, without affecting contrast.