How to develop photos

If it is a principle, the principle from film to photographic paper is the same as that of camera taking pictures and developing them into negatives. Generally speaking, it is to put the negative on a magnifying glass (similar to the principle of projector) and then the light penetrates from the negative and shines on the photographic paper, which is sensitive to light, produces chemical changes and controls the time. This process is actually similar to the principle of negative exposure in a camera. ) After washing, put the exposed photographic paper into the developer, put it into the stopping solution for a few minutes, then put it into the fixing solution for a few minutes, and finally rinse it with water. To put it bluntly, use photographic paper as a negative and expose it again with your original negative.