When I use my Holga and look at the results, once in a while I see the word "Kodak" appear on the negative. I am shooting Tri-X. The word "Kodak" does not appear on every roll. When it appears, it shows up on one frame, or maybe two or three frames in a row, but never in all the frames on the roll. It always appears in the upper right hand quadrant of the frame. Obviously, the word "Kodak" was nowhere to be seen in the original subject I was photographing. It is getting onto the film from somewhere, but I have asked several people knowledgeable about film and film processing and no one can tell me how I am getting the word "Kodak" to appear in my images, ie how it "prints" onto the negative. Can anyone help me understand where is this word coming from? How is this happening? My best guess is that the word is on the paper backing of the film and somehow it is getting "printed" onto the film itself, but I can't figure out how that could happen.