Wind slits are crescent-shaped cuts made on vinyl banners to allow wind to pass through the surface. These support lower harm especially against solid gusts. A black flag was used by the ʿAbbāsids in 746 ce (ah 129), the Umayyads deciding on white by contrast as well as Khārijites pink. https://custombannermodnotworking18483.review-blogger.com/53483595/about-medieval-times-flags