The wheels in my noggin has been going round and round again. So I wanted feedback and talk this out. My application will be primarily large format photography (4x5 format). Occasionally I use ND grads. Typically I don't' because they are difficult to meter and estimate (especially in the soft gradation. (question1: can you offer any suggestions regarding the metering while using ND-Grad filters?) I also like to shoot black and white film because it allows me to process and develop the film myself. That being said, the importance of colour filters doesn't need to be explained to me. Now, after reading all the literature I've have (and there is tons more out there) I've never read anything about using colour graduated filters for black and white photography. (question 2) : How will the use and application of coloured graduated filters differ from using a poorly made (colkin) ND grad filter that has a distracting purplish colour cast (when I shoot digital - I can't see it in black and white) (question 3) : Do you know many photographers who have used coloured graduated filters? Is this a successful solution to the problem of creating dramatic dark skies while maintaining shadow detail in the foreground? (question 4) : have you seen those Chinese coloured filters. No where near "Lee" (ironic) standards, but they may prove sufficient for my experiements.