It will always be more precise if you have pictures to see how severe the darkening is.
All cleaners used, the pH value is important to note.
Leather is an “amphoteric” material and it denatures when its original pH value is shift.
The pH of leather averages 4, is also known as the “iso-electric point” of leather often refer to as the “pI”
Any solution that has a pH higher than 5 in the cleaning process will darken progressively as the pH value goes up.
To reduce the darkening effect the possible pH value need to be neutralized with Acidifier-2.0 (pH 2.0).
Check out this darkened areas with a wet finger to detect for tackiness (a sign of leather denaturing to rawhide or raw-skin).
Acidifier-2.0 will both rectify the tackiness and lighten the darkening effect.
Hydrator-3-3 is a leather-safe pH 3.3 surface-active-agent that penetrates, activates and redistribute dormant dyestuff to resurface.
This function contributes and restores color loss through sun fading.
Fatliquor-5.0 contributes to the color by intensifying its shade and tone.
The Hydrator-3.3 and Fatliquor-5.0 is always used as a system. The hydrator-3.3 is also used to check for an even surface appearance free form surface tension prior to Fatliquor-5.0 to avoid any blotchiness in the presence of oily surface.
Roger Koh
[email protected]