A later formulation, Gelbkreuz 1, was a mixture of 40% ethyldichloroarsine, 40% ethyldibromoarsine, and 20% of bis(chloromethyl) ether.
Mai târziu formularea, Gelbkreuz 1, era un amestec de 40% etildicloroarsină, 40% etildibromoarsină și 20% din bis(clorometil) eter.