[shout]

I am looking for a chemical I can apply to paper which when I fire a laser 630-670nm will be effected. But the chemical need not to be effected by natural day light?

An one have any ideas???

[Loyal]

I am looking for a chemical I can apply to paper which when I fire a laser 630-670nm will be effected. But the chemical need not to be effected by natural day light?

An one have any ideas???

Effected in what way?

[shout]

i need a permanent line of some kind you can see with the naked eye.

[Phlogiston]

I am looking for a chemical I can apply to paper which when I fire a laser 630-670nm will be effected. But the chemical need not to be effected by natural day light?

An one have any ideas???

That's going to be pretty hard considering daylight has a lot of intensity from 630-670nm.  Good luck!