 Silk fabric samples were mordanted with alum and dyed with cochineal and gall oak shellac extracts, and their optimal dyeing parameters were determined. Post-mordentation with FES04 was used to enhance color fastness. RPH-PLC with DAD method was utilized for the identification of dye components and color coordinates and fastness values were investigated and compared. A mixture of these natural dyes resulted in good exhaustion and color fastness test results. This article was authored by Buju Ilmer Sahin Baskin, Rajep Karadag and Emine Torgan.