Nowaday, the process to produce photo is called "ying yen system". The process are one of the chemistry process. The completed steps to produce the photo are as follow:
expose the film? Strong alkali to capture the image ? Strong acid to fixed the image. Because salt will produce from the neutralize of alkali and acid, therefore rinse the photo with the water, to let dry and the complete. Normally rinse with water for about 30 minutes is needed to clear all the salt.
But nowaday, express process are required, therefore the "ying yen system" had been replaced by the "rolling system" which only roll out the salt with the roller.
Off course, a lot of salt will still left on the photo. The salt are what's the poison.
How poison it is?
Enough to stainess the stainless steel.
Why still using the express rolling system since it is that poison?
Don't ask me. I do not know.
Who ask you to chase the boss to produce the photo within 30 minutes....
Please remember
Do not kiss the photo
Do not put any food on the photo
Please remember to wash your hand after touch the photo
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