Photo by Gary. This is a detail of painting at Philadelphia Museum of Art The Alchemist, David Teniers the Younger, 1649, oil on panel, transferred to canvas, 23" x 33", held by Philadelphia Museum of Art.
See the whole image here. I could not embed that image from the museum web site due to licensing restrictions.
As I searched the web for an image of the whole painting that I could use, I encountered a phenomenon that I've now seen again and again: namely, multiple works by the same painter, often with the same title, held by different museums.
In this case, Teniers seemed smitten with alchemy, making it the focus of at least 3 separate paintings.
Given the fact that alchemy is bogus, Teniers would have been better off sticking to something real as his subject: cats. He did a great job with the kitty in the image above, capturing perfectly the obvious thought of the cat: "What are you staring at?"