Dating postcards stamps
But even collotypes will exhibit a discernible grain when magnified.
They were replaced by offset printed cards during the 1910s because they did not lend themselves to high-volume printing.
Because the negatives were large (often postcard size), these images are extremely clear. Photochrome postcards (or "Chrome") appeared in the US around 1939 and in Japan after the end of WWII.
They were easily produced, in color and of high quality, so they soon replaced all other cards.
There are even reports of people who died in fights. After the war ended, postcards became less popular among Japanese, but the boom was kept alive by the increasing number of foreign tourists.
Because the souvenir postcards that they bought were sent back home, they were able to survive the fires, earthquakes and war that destroyed so much of Japan during the 20th century. There are several ways to date a vintage card: through its postmark, the stamp used, the use of a dividing line and the type of printing used.Though most of us today are familiar with the concept of photo grain, this is mostly because we have experienced very large prints made from small 35mm negatives.But even here the effect is more of a softening of detail than a observable texture.The tonalities of photos are completely continuous to the eye producing true greys, for they are created by the reaction of individual photosensitive molecules to light rather than the transfer of ink from a plate.