I've read quite a bit about Pyro development but only used it a couple of times having recently purchased a kit in the UK. I have to admit to having had a degree of scepticism when it began to gain popularity a few years back. However, having printed a few pyro negatives for clients and on workshops and printing demonstrations during the past year or so I have been impressed with the results. I would like to ask a few questions of those who use pyro. I have ordered Hutchings Book of Pyro. I understand that there are different types of pyro dev, if so what are the differences. I shoot a lot of 35mm in my documentary photography and have to deal with extremes in lighting and contrast. I know of pyro's ability to control contrast but have heard that it can increase grain. Would you share your reasons for using it and your formula if you mix your own. Thank you.