Hello,
I'm going to repair some cracked joints in the facade. It's made of mexisten laid with white mortar. I found an old bag that was probably used when the house was built. It said "Serponit vitbruk, Ernström & Co" on it. However, it seems they no longer exist and have probably been bought out by some giant company, like Maxit.
So if anyone has tips on where to find white mortar that works with mexisten, I would be grateful.