Huizhou Foryou Optical Technology Co.,Ltd (“FYOTEC”) was founded in 1996, focusing on development, application and promotion of special materials. Optical Changeable Effect Pigment (OCEP)  and Optical Changeable Effect Ink (OCEI)  are products used in high security for anti-counterfeiting, of which we have spent 20 years developing and improving. Throughout the world, we have provided protective services to secure security documents for governments and valuable brands for their owners.