This is a long process. First you must develop your negatives in a developing tank. Next is to cut the negatives into strips of 5 pictures in a strip. Next you make a contact sheet. this is when you put the negative in contact with the strip. Then as you apply light to the paper you reveal more and more of the strip each time. Following this step you can do a contact sheet strip all on the same amount of time. the time varies on which on looked the best on the previous contact sheet. Now that you have made a full contact sheet on the same time you can make a 4x7 of the best looking individual negative. Here, you will make a test strip on one negative. Once you find the best looking amount of time you can proceed to make a 4x7 all on one amount of time. Here you are left with your finished product.