Invisible pen and glasses?

Question

Is there anything cheaper than this?

http://www.advanced-intelligence.com/invisibleinkglasses.html

I need invisible ink and glasses to see the ink, no lights, no lemons, no special gear... any ideas?

Answer 1

invisible इंक से लिखे पेपर के नीचे आग दिखा दो . थोडी देर मे लिखा हुआ दिखने लगेगा