Carlo photography

1. Use the best writing paper, dip it in dilute silver nitrate solution under red light, then dip it in potassium iodide solution and dry it.

2. Paint a layer of silver nitrate and acid solution on one side of the paper with a brush, put the photosensitive paper in front of the fire to dry, and then put it in a light-proof box for shooting.

3. Expose in a black box for 1-3 minutes.

4. Put it into the silver nitrate and acid solution used in step 2 for development, but the water must be doubled to halve the concentration of the solution.

5. Fix with hypo solution, then wash with water and dry. 1. Soak another piece of paper in salt water and dry it.

2. Under the red light, brush a layer of silver chloride solution with a brush and dry it.

3. Cover the negative on the paper, press it with a picture frame, and expose it in the sun until a dark brown image is formed on the paper. (about 20 minutes)

4. Fix the image paper, rinse it with water and dry it.