PFA 4% in 1/3 SW PFA 4% in 1/3 SW kdorfman Thu, 10/10/2024 - 15:39 4% paraformaldehyde in 1/3 ASW Paraformaldehyde stock (EMS RT 15714): 32% To make mL fixativeat: % PFAadd: mL 32% paraformaldehydeadd: mL 1X ASW