Keep in mind that PFG-03 may not be a 100% reliable source for Lippmann photos. Perhaps there was/is too much fluctuation from one batch to another.
Originally Posted by SemFyzik
As for the processing, some rehalogenating bleaches may actually damage the integrity of the recorded “Lippmann fringes“. So using a colloidal developer like GP-2 or alike seems to be a better approach. Since that method doesn't involve any bleaching, the finished layer will show both amplitude and phase characteristics.