Abstract: A method of producing a solid electrochrome element comprises depositing a layer of an electrochrome material onto a substrate having an electrically conducting layer in a vacuum from about 10.sup.-6 mm Hg to about 5.10.sup.-2 mm Hg at a vaporization temperature of from about 1,200.degree. C. to about 2,500.degree. C., the substrate temperature being maintained within a temperature range from about room temperature to about 500.degree. C.sub.x ; and coating the electrochrome layer with a layer of insulating material vaporized in a vacuum from about 10.sup.-7 to about 10.sup.-4 mm Hg at a temperature of from about 1,300.degree. C. to about 2,000.degree. C., the substrate temperature being kept within a temperature range from about room temperature to about 300.degree. C. The solid electrochrome elements produced by this method and characterized by a fast speed of action.

Abstract: An electrochrome element control device comprising a voltage source connected in parallel via a switch with a circuit composed of a series-connected electrochrome element and a capacitor for limiting the time the voltage is supplied to the electrochrome element, the charged capacitor supplies voltage of opposite polarity to the electrochrome element upon closure of a second switch connected in parallel to the circuit composed of the electrochrome element and the capacitor. Control of the electrochrome element is considerably simplified therefore.