Ah, ok. I tried the texture in the diffuse slot, but the shadow stays grey. Why not let the user decide - color or b&w? For the artistic freedom it would great to have the choice. It would be logical to have a colored transparency for thin-walled objects like colorful church windows.
Also there should be a refraction texture slot for colored textures. Is it at the physic based material? I look for it but can’t find it.
At V-Ray I can set a colored refraction texture and if I enable “thin-walled” than I get the perfect result. But I can’t use the Bongo video texture here.