These functions are invisible under regular light but become obvious when exposed to UV rays, producing UV light detection hugely dependable. Regular detection procedures like watermark examining and magnetic ink detection have their merits, but UV light typically proves excellent: Look at the General design and style of the pen. https://how-to-tell-copyright-b22119.angelinsblog.com/37820058/the-best-side-of-hong-kong-dollar-100