Du-Lite Corporation is a Connecticut based small business founded in 1939; the corporate office is located in Middletown, Ct. Du-Lite Corporation has been a leading supplier of black oxide (bluing), and manganese phosphate (parkerizing) finishes for firearms which prevents rusting and enhances their appearance. An important part of our success has been the technical support we provide our customers. We maintain a complete laboratory facility to assist customers in solving their most difficult metal finishing problems. (less)