The 2023 law that went under the radar restricts the imports, sale and distribution of products containing lead or cadmium.

Many of the phosphorescent pigments now manufactured in the U.S. are sulfides, chiefly of strontium, zinc, barium, calcium, cadmium, etc.; and a large group have formulas that are military secrets.

Several other paintings from this period are facing similar issues. The bright yellow paint these artists used was made from the chemical compound cadmium sulfide. The pigment was beloved by many ...