I know this has been asked thousands of times, but bear with me. I recently bought a very large undyed unfinished double butt piece of leather from Tandy. I usually work with pre-dyed, prefinished leathers, but I figured I’d take a risk and learn how to die and finish leather myself. However, an unexpected issue that has risen is that before I can even get to finishing/dying, mildew/mold begins to form on the belt on both sides, very soon after I finish stamping a design(I’m talking under an hour). What on earth do I do to make sure this doesn’t happen? This also happened with the same leather when I attempted to wet form leather around an AirPods case and when I clamped a piece of leather to make a key tray. The mold in question is little black spots, that don’t smell or feel strange, but are definitely very noticeable. Could it be because I soaked the leather overnight? I usually only soak it for an hour or two, but I had some extra time so I wanted to see if it’d make a difference. My basement is fairly low humidity, and I have a dehumidifier running constantly set to about 45%. I tried rubbing it with diluted alcohol, but that had little to no effect. I’d appreciate any and all ideas!