1. Instruction: It will change color when viewed at different angles, in an attempt to deter counterfeiters, used on many major modern banknotes.
2. printing method: only screen printing is acceptable
3. dry method: nature dry(air dry)
4. screen mesh required: 100-150 mesh is better
5. colors for options: green to purple, purple to green, purple red to green, green to blue, gold to green...