I had seen some people selling SaPuloh Watermark agong UV light in a blog for RM200,000 before. The banknote is exactly a real note with agong watermark in UV light. If you look close enough on the banknote picture, the tiger watermark is still there and the agong watermark is on top. You can only see the Agong watermark in the dark. Sorry, I am not sharing the picture of the mention blog in here, you can try search it in Google. A watermark is a recognizable image or pattern in paper that appears as various shades of lightness/darkness when viewed by transmitted light (or when viewed by reflected light, atop a dark background), caused by thickness or density variations in the paper.
A bit funny to me when many Malaysian believe that such thing is real and many Malaysian don't know how easy it is to print or write a UV light pictures and words. You can buy an invisible UV ink cartidge at lowyat for a small amount of money. The ink is uv light sensitive ink, which is invisible under normal light. You can also buy UltraViolet light pen in Petaling street. That's mean you can also make it youself if you can find UV ink cartidge or UltraViolet light pen. There is no Sapuloh watermark agong produced by Bank Negara.
Here is a video from Youtube, show how easy it is to print a UV light design:
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