False Colour From Filters (and Simulated Filters) - Photography - Beneath the Waves
Red – Dark Filters on the App Store
Leica Stockholm - Buy your Leica camera at Wibergs Foto - B+W 090 light red filter 39 mm MRC
Light Red Filter - Light Red Filter - 62mm Light Red Camera Lens Filter (25) - Heliopan US
KitDive 67mm Red Filter for underwater photography (Wet) — meikon.hk
Sample files with and without a red filter added: Black and White Photography Forum: Digital Photography Review
LunaPic | Free Online Photo Editor | Color Tint
Red – Dark Filters – Apps on Google Play
Red Filter & Frame - For Facebook profile pictures and frames, Twitter profile pictures, Youtube profile pictures, and any pfp you have plus cover photos, banners, and logos. If you're raising awareness