I am trying to produce a piece of paper which is coated which is not
effected by daylight but when a light wave of 630-670nm is pointed at
it will leave a permanent mark i.e. black dot on white background.
Can you advise me how I could achieve this or if you could guide me in
the right direction. Thank you
mark
effected by daylight but when a light wave of 630-670nm is pointed at
it will leave a permanent mark i.e. black dot on white background.
Can you advise me how I could achieve this or if you could guide me in
the right direction. Thank you
mark