Patrick; These days the best and really only way is to have the old neg scanned, then take all the colour out using software such as Photshop or any image manipulator, then print it on an inkjet printer or take the file to a shop that uses a Fuji Frontier machine and have them make you a B&W print from the digital file. This will give much superior results to messing saround with Panalure.(posted 8193 days ago)OR, go to a good pro lab and have them print it on the new RA4 B&W paper they use for printing from C-41 B&W negs.
Good luck.