>>> Any ideas on what has happened
If there is a musty smell, then its mold growth.
MOLD: Mold is the colloquial term applied to a large diverse number of fungal species where their growth result in a moldy appearance on objects, including leather. A layer of fungal growth discolors such objects. Molds are fungi that grow in the form of multi-cellular filaments called hyphae. The hyphae are generally transparent, so the mycelium appears like very fine, fluffy white threads over the surface. The dusty texture of many molds is caused by profuse numbers of asexual spores formed by differentiation at the ends of hyphae. The mode of formation and shape of these spores are traditionally used to classify the mold fungi. Many of these spores are colored, making the fungus much more obvious to the human eye at this stage in its life cycle. Molds cause biodegradation of natural materials like leather. It can then be unwanted as mold-damaged property. Mold requires moisture for growth. Like all fungi, molds derive energy not through photosynthesis but from the organic matter on which they live. Typically, molds secrete enzymes that degrade complex substances into simpler substances, which can be absorbed by the hyphae. Molds reproduce through producing very large numbers of small spores. Mold spores may remain airborne indefinitely or cling to leather and fur. It can survive under extremes of temperature and pressure.
>>> and how I could treat the leather to remove the spots
To treat the leather from mold growth will need this Leather Doctor Kit-A3.mk - Leather Mold Odor Killer Kit.
http://www.leatherdoctor.com/kit-a3-mk-leather-mold-odor-killer-kit/
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>>> and get a smoother finish?
If you want to smooth the finish you may need to refinish again with AnilineTop-21 Gloss, Satin, Natural or Waxy-Matte of choice.
A tactile-feel smooth is accomplished with Protector-B/B+
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Roger Koh
Leather, Skin & Hair Care System Formulator
Consultant / Practitioner / Instructor / Online-Life-Coaching
online store: www.leatherdoctor.com
forum: www.leathercleaningrestorationforum.com
email:
[email protected]