How to remove stains from photos without protective film?

First, clean the fingerprints on the photos. You need to prepare a basin of clean water. We first put the photos with fingerprints in clean water, and then gently wipe them with cotton swabs or paper towels. Tips: First, when cleaning photos in water, be sure to touch them gently, and don't rub them hard. Second, don't soak the photo in water for too long, and wipe it immediately after entering the water, otherwise the color of the photo will be damaged. After wiping, you will find that under the action of water, the fingerprints on the photos are gone. Next, take out the photo and stick it on the mirror, so as to prevent the photo from curling and deforming, and then blow dry the photo with the hot air of the hair dryer. Tips: First, the hair dryer should not be too close to the photo and keep a distance of about 30 cm; Second, the temperature of hot air should be controlled in a low or medium range, not too hot. When the surface of the photo is dry, take it off the mirror and put it on a flat surface, and then blow dry the other side of the photo with a hair dryer. It is also required that the temperature of the hair dryer should not be too high, about 30 cm away from the photo. After such treatment, you will find that the handprint on the photo is not only gone, but also the photo is intact.

Seeing this, you must think, can all stains be removed like this? Next, we use the same method to remove the brush track on the photo. First, we put the photo in clean water and gently wipe it with a cotton swab, and soon the brush marks on the photo disappeared without a trace. In order to keep the photo intact, we then stick it on the mirror, blow dry it with the low-grade hot air of the hair dryer at a distance of 30 cm, and then put it on a flat surface to blow dry the back. After such processing, the brush track on the photo disappeared, which is meaningful.

After many experiments, we found that tomato juice, milk, etc. can also be removed from the photo surface by tricks, but for black tea, coffee and other stains, after cleaning by tricks, traces will still be left in bright places, but not in dark places.

Then why can you remove stains by gently wiping in water? In fact, this is a good use of the structure of the photo. In fact, if we analyze the cross section of the photo, we will find that the photo can be divided into two levels: printing paper and colored paper. And in order to prevent the photo from changing color, its surface is a layer of transparent filter paper. Filter paper has the property of being soluble in water. If you wipe the stain with a wet cloth, this part of the filter paper will become soft and deformed, leaving traces. But if you put the whole photo in water, all the filter paper on the surface of the photo will be completely removed.

Finally, I would like to remind you that the photo taken with a digital camera is not suitable for this method, because the photo paper it uses is not this ordinary photo paper.