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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.

The code is relief, not image. It sits in the same place on every denomination, so a finger knows where to go before it knows the answer.

  1. The position is fixed: the left and right edges, near the outer side of the sheet.
  2. The number of pairs increases as the denomination falls, so counting with a finger is itself the answer.
  3. The lines are raised rather than merely printed. That places the feature on the diraba channel — and it is why a screen cannot convey it.

Download diagram (SVG)

What to observe

  • Run a fingertip along the left or right edge of the note. The lines are short, slanted, and feel rough.
  • The number of pairs marks the denomination: Rp100,000 has one pair, Rp50,000 two, Rp20,000 three, and one pair more with each step down to Rp1,000 with seven.
  • The notes also differ in length by 5 mm per denomination, so the size of the sheet helps distinguish them too.

This page explains how to check a feature, not how one is produced. Nor does this site say whether any note is genuine — that authority rests with Bank Indonesia.

Appears on

Sweep the light

A screen cannot convey touch, but it can show the other consequence of raised printing: ink standing above the surface catches light from a low angle and shadows the far side. Move the light around.

20°

The surface here is a run of plain ridges, not the engraving on any note. It shows how relief catches light — it is not a substitute for feeling it. For that, still take out a note.

Sources