8x10 korona view by seebold invisible

[uphereinmytree]

So I can't find a definitive answer to whether the bellows on this camera is leather or a synthetic material. The bellows look great but haven't been opened in a long time. they don't feel very stiff, but i don't want to hurt them by moving them around until I've done what I can to clean/condition them. Any ideas appreciated

[Doug Howk]

My Korona 8X10 is from around same timeframe. When I got it I sprayed a leather cleaner on it. Had some light-leaks on corners, so painted all inside corners with electricians liquid tape (keeping bellows extended while drying). No light leaks since.