Hi - I always use Pantone Black C for all spot jobs (logos and stationery mainly) If the client wants a grey I use a solid Pantone Grey, never a tint. However I have a client who insits on having a 1 colour job and wants a black and a grey - making a tint though from the Pantone Black C appears yellowy / brown (bit like the RGB - CMYK converted black) However when using Pantone Process Black C - a tint looks more like grey. This makes me wonder what is the best Black to use? What are the differences? Thanks!