Some unscientific testing of a red filter + polarizing filter for B&W : r/AnalogCommunity
Filter Types | B+W
Amazon.com : B + W 40.5mm UV Protection Filter (010) for Camera Lens - Xtra Slim Mount (XS-PRO), MRC Nano, 16 Layers Multi-Resistant and Nano Coating, Photography Filter, 40.5 mm, Clear Protector : Electronics
A Guide to color filter used with B&W Film - The Darkroom Photo Lab
B+W Filters - Genuine or Counterfeit: Accessories Talk Forum: Digital Photography Review