Fabric painting has changed over time. There are all sorts of books out now on applying paints to fabrics. This kit from the 1950s or 1960s had a simpler goal—to replace making lines of embroidery stitch with lines of paint.
The printing, the colors, even the "scientific" name of the product all sit squarely in its time.
This package showed up at last year's supply swap at the MCBA Visual Journal Collective. You never know what people are going to bring and what you might find.