You can't tell seeds are viable or not by color. One way to test the viability of seeds:
"Seeds collected were soaked in filtered triphenol tetrazolium chloride (TTC) solution (1 g in 100 ml phosphate buffer, pH 6.5-7.0) for 48 hours in darkness at 20ºC and rinsed five times in sterile distilled water. Seeds were agitated between coverslides to remove the testa and viewed using a light microscope. Embryos completely coloured pink to red were considered viable, whilst seeds with embryos partially coloured, white, yellow or brown were assumed not viable....."
You will sow them anyway so why worry about viable or not. The following is the picture of Phal. seeds I sew a month ago. Cheers