What does Albert use as a carrier of images?

1833, Talbot treated silver salt on paper, printed it directly in the sun, and then fixed it with concentrated brine. At 1840, he exposed the paper coated with silver iodide in a black box, and then soaked it in concentrated salt water to prevent the image from blackening further. At this time, a negative image is obtained, and then the negative image is printed on another photosensitive paper with light. Talbot applied to the British government for a patent for his negative and positive system photography, which is called "Carlo-style" photography.