Gold Protein Detection Kit for MembranesSupplied in Kit: 500ml Ready to use Gold Membrane Stain 100ml Wash Buffer (100X) Cytodiagnostics Gold Protein Detection Kit for Membranes is a stabilized gold solution specially developed to stain proteins blotted onto nitrocellulose or polyvinylidene difluoride (PVDF) membranes. The negatively charged gold particles bind to protein(s) on the membrane through ionic and hydrophobic interaction with much higher affinity than to the membrane itself.