Tiffens filters are typically a colored thermoplastic film sandwiched between two sheet of glass. I sometimes use deep blue and green Tiffen tricolor
filters for split printing using a blue-green cold light on one of my 8x10 enlargers, as well as for either extreme subject filtration in the field using
8x10 panchromatic film, or for simply slowing down the exposure dramatically, much like a neutral density filter. The 47 or 47B also render a highly atmospheric look with open shadows, much like old time blue-sensitive plates. Of course, 8x10 film doesn't need to be enlarged much to achieve
a relatively big print itself. But with smaller formats, I really prefer true multicoated glass filters of the highest quality. If you do select Tiffen, keep
a good microfiber lens cloth handy, because its plain glass does smudge, retain dirt, and especially condense moisture easily, fogging up. And you will obviously need to shade your lens well too.