The earliest photography technology in the world photography history.

The earliest photography technique was discovered by Nipps, a Frenchman, and named as "sunlight etching".

? /kloc-At the beginning of the 9th century, lithography technology appeared. Nipps is very interested in this. Since 1793, he has been engaged in the experiment of permanently preserving images with photosensitive materials. Committed to this technology, in order to improve the lithography technology, in order to achieve the use of light instead of lithography chalk drawing.

? 1822 he used glass as the film base, coated with tar as the photosensitive material, and then laid the layout to be copied flat on it and exposed it in the sun. Because the layout has been oiled, the light will be projected on the asphalt because of the difference between black and white on the screen. The unexposed part has been dissolved and removed, and an image composed of light gray background and black lines can be seen when viewed in front of a dark background.

In 1825, Nieps uses metal instead of glass as the bearing photosensitive material, and obtains a fixed image that can be directly viewed by reflection. It was during that time that he photographed children and horses, which have been passed down to this day. Its original film is17th century Dutch prints. Although people think that this photo is the first one with an exact date in the world, it is actually a copy of a painting. What really captured the image was another frame "Scenery Outside the Window" created by Nieps at 1826.

? This work is made of tin alloy coated with asphalt, put into Nipps's homemade camera, exposed in the attic of his French residence for 8 hours, facing the window of the sky, and then dissolved the asphalt in lavender oil. The exposed part of the asphalt photosensitive layer is hardened and insoluble, and the other parts are completely or partially dissolved according to the light receiving amount, so that an image appears and is permanently fixed.

Nipps named his method of using sunlight to act on photosensitive asphalt to permanently fix the image on glass or metal plate as "sunlight etching method". This is the earliest photographic technology system in the world.