What Is Leather Spew?

It’s a substance that rises to the surfaces of the leather hides, this is oils and fatliquors that have risen to the surface leaving behind a crystal-like effect, almost like a white or brown powder effect. It’s known as Leather Spew or Spue and can also be called Fatty Bloom.

People often mistake Leather Spew for mould as its characteristics are very similar to a damp mould growth like a white thin film.

Leather Spew On The Surface

Fatty Bloom or Leather Spew Migrated To The Surface Of The Leather


Due to people mistaking Leather Spew or fatty bloom as mould, you can tell if it’s mould or Leather Spew by carrying out a very simple test using a hairdryer. Leather Spew will melt when heated up, so always heat up what appears to be Leather Spew or mould with a hairdryer If it’s Leather Spew it will melt as it’s fat that has migrated to the surface.

A normal cleaner will remove the Leather Spew but this will return again, you need to use specific cleaners to remove Leather Spew.

Once you have cleaned the area with the Leather Spew Remover, allow the item to sit for a few hours before cleaning as normal. Delicate leathers like Veg Tanned, Bridle Leather and Aniline Leather have to have great care taken when cleaning.

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