One of my resolutions is to use up all the film that's been sitting in my fridge for years before I buy another single roll. I have a load of Velvia 50 120 way past it's use-by date, and at the same time an opened Fuji Hunt c41 kit that's rapidly going off. So why not kill two birds with one stone - shoot the Velvia and cross-process it in the c41 kit. 1) Do I need to do anything different when shooting - just rate the Velvia at ISO 50? 2) Do I need to alter the timings of any of the stages when developing C41? Or is this not such a good idea?