thanksI once used 23 year old bear fat. I still have the soap stored away as a experiment, its not gone rancid but it does smell old and freezer burned. Maybe try a small batch and see how it does.
Well the containers were well sealed and completely dark. It's completely white and smells a little.Since home-rendered fat can sometimes have excess moisture in it, I would check it for mold first. Any discoloration from a smooth, creamy white or just-off-white color is suspect. Then, smell it. If it smells awful, it'll either make stinky soap, or will at least mess with any attempts to scent it.
While animals fats generally have a long shelf life, so much depends on how they're stored, so just saying it was in a plastic container doesn't really mean much in terms of longevity.
Sounds like it's fine. Remember, some of the odor may persist in the soap, but you can't tell until it's cured. My high-lard bars smelled pretty piggy a week after I unmolded them, but now smell like nothing.Well the containers were well sealed and completely dark. It's completely white and smells a little.