I am doing surface failure analysis for a ball bearing SKF 6025, , as an exercise, It has been used in the washing machine tub, after some time a noise has been reported and it is no longer rotating. When i got it I opened the seal and captured the attached photo. I had a feeling that it suffers rust corrosion, but I wasn't sure if it is rust or just old grease. I soaked it overnight in a gasoline basin to dissolve the grease and see if it is rusted or not. I captured image number 2 but I don't feel it is rust. What do u think ?