when working as lactation specialist on a postpartum unit, I decided to practice my very effective hand expression technique so I could explain what I was doing(I was really good at it, used to express my milk directly into a bottle, to avoid losing even one precious drop and to avoid cleaning pump parts) and lo and behold I got some of that "salad dressing" too! I think being around all those adorable babies contributed to it too. My youngest hadnot breastfed for at least 4-5 years.... Pearl Shifer BTW-I don't think this is colostrum-it's the "weaning" milk as the glands involute...