Blind Embossing
A colourless relief image applied on a coloured or unstamped area of the banknote by pressure or heating which deform the substrate. It is a palpable image used both in paper and polymer banknotes (fig. 1); is visible under oblique light. A coloured image gradually transforming into blind embossing is a more intricate security feature (fig. 2).
![](https://static-content.regulaforensics.com/Glossary/Banknotes/A-H/Blind_embossing_01.webp)
Fig. 1. Blind embossing on the clear window.
20 Mexican Pesos F series (2006).
Polymer substrate
![](https://static-content.regulaforensics.com/Glossary/Banknotes/A-H/Blind_embossing_02.webp)
Fig. 2. Coloured image gradually transforming into blind embossing.
1 000 Yemeni Rials (2009). Paper substrate