Killing mold on holsters and preservation

[lugerholsterrepair]

From the link Sergio kindly provided.. Ballistol effectively protect leather against getting hard and dry, " your vegetable tanned molded & formed Luger holsters are SUPPOSED to and STAY hard & dry. " ONLY the VERY surface NEEDS anything and that doesn't happen with a PENETRATING OIL!"
against water, " AGAINST WATER? Yes, oil & water don't mix. insects and fungi. Residues of tannic acid in leather will be neutralized dry leather softens and gets elastic again " Softens! LISTEN to what Ballistols says! Softens! "with a dull shine bright leather can get darker "can and WILL get darker because it's PENETRATING OIL!" typically the smell of ballistol will evaporate quickly there will be no greasy film "Not greasy because it will be oil soaked." on the leather.
I won't beat this donkey any further.