Eight mechanisms
The features and how they work
Each feature is drawn in cross-section: what happens in the material, and what you should observe. There is not one photograph of a note here.
Diterawang — held to light
Watermark & electrotype
An image in the substrate itself, visible when the note is held up to the light.
Diterawang — held to light
Security thread
A thread that sits inside the substrate rather than printed on its surface.
Diterawang — held to light
Rectoverso (gambar saling isi)
Two complementary halves of one image, printed on the front and the back so that they lie exactly over one another.
Diraba — felt
Raised printing (intaglio)
Printing that feels rough to the touch, because the ink stands above the surface of the material.
Has a screen limit
Diraba — felt
Kode tuna netra — the blind code
Pairs of raised lines at the left and right edges, letting a denomination be identified by touch.
Has a screen limit
Dilihat — seen
Colour-shifting ink
The printed colour shifts as the note is viewed from a different angle.
Has a screen limit
Dilihat — seen
Microtext
Lettering too small to read with the unaided eye, legible only under magnification.
Machine & UV
UV-visible elements
Areas invisible in ordinary light that emit visible light under an ultraviolet lamp.
Has a screen limit