26mm nabój specjalny znakujący / 26mm special cartridge marked
No detailed information about this cartridge. There was definitely a project to develop such ammunition, because the cartridge is mentioned in the RGZ-86 instruction manual with the annotation that it is being developed.
It is not known, however, whether he remained in the sphere of the project or he passed into the testing and testing phase. There is no information about its construction and possible operating principle of such ammunition. It is possible to guess that the aim was to mark people who were hardly washable with colored paint and actively participated in group demonstrations, so that they could be easily identified and captured after the demonstration. Perhaps, however, this concept was abandoned.