Fig. 1From: Qualitative analysis of Sudan IV in edible palm oilSERS spectra of a) 1 μM Sudan IV dye b) the unadulterated and the prepared palm oil samples with different concentrations of Sudan IV and c) the other palm oil samples obtained from FDA Ghana. The measurements were conducted at λ = 514 nm with a lasing power of 50 μW and an acquisition time 10 sBack to article page