131 used to be a glossy surface. Somewhere in 2022 Foma had to change the surface due to lack of raw materials. They decided to keep the 131 nominator, but change the corresponding descriptor from 'Glossy' to 'Semi Glossy'.
The statement that it is, or continues to be, suitable for lith printing is debatable. Wolfgang Moersch says it does lith, but not as good as before the change.