Bulgaria announces modified 50-lev banknote

The Bulgarian National Bank has announced that a modified 50-lev banknote will be issued from 1 November 2019. The note is part of the new modified series. The overall design and main features of the new banknote remain unchanged with respect to the banknotes in circulation. Changes in the banknotes of the new series stem mainly from the introduction of new security features.

Some of the new safety features:

An additional sign for the blind: it consists of four thick and seven thin lines, angled at both short sides of the banknote.
Holographic band with optical effects: alternating images of a bird and Icarus alternate when the viewing angle changes; color hologram portrait of Pencho Slaveikov; a book that changes color from golden to green when the viewing angle changes; a dynamic flame effect with a change in color from golden to green as the viewing angle changes and a 3D image of the number 50.
Optical Effect Ink: the number 50 is printed with a color-changing, dynamic flame ink that changes from golden to green when the viewing angle is changed.
Security thread: embedded in the paper and partially protruding from the reverse with a light repeating text "BNB 50" and a dynamic flame effect changing its color from golden to green. The image of the repeated text "BNB 50" can be read from the front when the banknote is placed against a light source.
High resolution watermark: can be observed when holding the banknote against a light source. It consists of a high resolution halftone image of Pencho Slaveikov's portrait. The images can also be observed on the back of the banknote.

Update 7-11-2019: the new note has been issued.