How to tell the authenticity of a photo?

Protein photos are generally dull, and the color is blue or yellow. Generally speaking, the hair taken by foreign photographers is clear, while the hair taken by China photographers is yellow, mainly because of the poor fixing skills of China photographers at that time.

2, look at the clarity:

The original photo is printed directly from the bottom plate with high definition. And the definition of the remake photo will be greatly reduced. Careful observation shows that there will be some watermarks or scratches on these remake photos, which are caused by the photos before remake during storage. The collection value of reprinted or remaked photos is greatly reduced.

3, look at the size:

The longest photo of the Qing dynasty will not exceed 30 cm. Generally speaking, the protein photos before 1880 are all about 25X20 cm, and the protein photos from 1880 to 1890 are slightly larger, but with the development of printing technology after the Republic of China, large photos were obtained. Panoramic photos of the Qing Dynasty were all hand-stitched, and it was not until 19 10 that we saw the photos that turned the corner.

4. Check for scratches and cracks:

Although the photosensitizer and paper base of silver salt photos are integrated, the whole paper base will crack or scratch after long storage. Those old photos that are falsified by chemical methods are smooth when viewed with a magnifying glass or sideways to the light, and there will be no cracks and scratches.

5. Look at the content:

Judge the shooting age, photographer, etc. The content of a photo. This kind of appraisal requires the appraiser to have rich historical knowledge.