I just wanted to say thanks to everyone first for all of your help. I just developed my first roll of B&W Kentmere 400 and it's just gorgeous! So I shot a 24 exposure roll and got lovely results I just have to get them scanned ^_^. However, six of the exposures came out 'blank' and by blank I mean clear. Except for one which just has the barest hints of my cat's face. The ones that came out I shot outside and the ones that didn't were inside. So I think I didn't adjust my shutter speed or aperture at all. And being absent minded that I am, I think that's what I did. My sister even did this too when she started photography. Does anyone else know what might cause this and how to prevent it in the future? I couldn't find any other information on it either.