Vintage Dr. Martins's Radiant Concentrated Water Color Set

My husband loves to go to estate sales. I usually tag along. Today we went to a sale at a famous local artist house. There were lots of unsigned art, one of which I really wanted but thought it was overpriced to be unsigned. However they did have her Dr. Martin water color set for sale, it was marked $10 but I purchased it for $5. I was so excited, all of the colors are still good. When people saw me with it, they asked what is it? One lady thought it was spices.