I'm trying to take pictures of some flat metal parts that have serial numbers engraved in them. The goal is to generate life-size transparencies that can be overlaid on actual parts to verify the position of the serial numbers (I work on the tools that put the numbers on the parts). I already tried scanning one of the parts on a scanner, but the numbers don't show up--you have to use a particular angle of light to get the serial numbers to reflect back. I'm shooting onto Arista II ortho litho in a 4x5 camera to fill the film. Then, I put the negative into my enlarger and adjust it to life-size, using one of the actual parts to get the magnification right. Then, I print onto an 8x10 piece of ortho litho, and contact print that to a 3rd sheet to make as many semi-disposable transparencies as needed. It's working fairly well except I'm having trouble exposing and developing the film. I don't have special developer for it so I'm using Dektol diluted 1+2 with water. When I hold the transparencies up to the light, the dark areas are mottled and streaked, even when I try to agitate well in the developer tray. I'm thinking about either trying brush development or film developer instead of paper developer. I also don't know if I should be leaving it in the devoloper a 'long time' and developing it essentially to completion, or if I should be timing the development. Right now I'm driving myself crazy adjusting both exposure and development. In principle I don't need to use orthro litho film--I might try TMX for the camera part--but ortho litho makes sense for the final transparencies because it's cheap and the 'ortho' part makes it easy to work with.