Depending on pigments and papers etc, the image may or may not be visible after exposure. Processing Place paper face down in warm water. After several seconds or a minute, turn over carefully to check development. Very careful splashing or brushing on certain areas can bring out details, but the wet image is very fragile and easily destroyed. An overexposed image is quite tough, however.
Development can take only a minute to overnight.
With short exposures, the image may be complete as soon as the paper is turned over. Long exposures can produce images which need to soak a long time and possibly be helped along by hosing or splashing to be finished. When the print looks good to you, take it out and dry it flat or hang it up, whichever is more suitable for the image. In some cases, some images might bleed or slide off the paper if hung up to dry, while other times, water may pool up and distort images on prints left to dry flat. This can be caused by many things.