Union optic Color Glass Filter Due to its selective absorption in visible wavelength range, color glass filter will exhibit various color depending the glass type. Color glass filter provides an economical filter for various applications. Optical ... Inquire Price Sold by: Union Optic Ships from: China Specifications Shape: Round, Square, Custom Size: 25.4 mm Thickness: 3 mm Color Series: Yellow, Orange, Red & Black, IR Transmitting, Black & Blue, UV Transmitting, Colorless, VIS Tr, IR Abs, Green, Blue, Blue-Green, Multi-Band