Vachetta Leather Browning/Dye/Grease/Ink/Tarnish Remover - Kit-V6 by Leather Doctor is a combination problem solving kit that includes products from Kit-V5.dr, Kit-V5.ds and Kit-V3. Common stains encounter in the course of vachetta leathers lifetime includes the darkening effect from neglected body oil, grease and sweat contact, the occasion ink and dye transfer, and the browning from liquid and sun tanning seasoning effect just like our skin. The protein leather fiber is an ionic positive (+ve) “amphoteric” material thus pH sensitive to influence by alkaline solution shifting ionic negative (-ve), even water with a pH of 7 often discolors or browns it. Its other non-amphoteric leather constituents like the tanning agent and the fatliquor remains ionic negative (-ve), hence just like a magnet – “like poles repel”, breaking of the hydrogen bond between them, the leather denatures and in extreme cases revert to rawhide. This adverse browning contamination is rectify by Degreaser-2.2 > Acidifier-2.0 system, both to simultaneously degrease and protonate the protein fiber ionic positive (+ve) to its pH chemistry integrity. Ballpoint, printing ink, dye transfer, gum, sticky substance and accumulated soiling will require the penetrating, lubricating and suspending power of LeatherPrep-4.4 follows with LeatherClean-3.8 to remove the sticky residue and LeatherRinse-3.0 to a healthy squeaky feel. Browning from liquid stain or sun tanning is eliminated or reduced by chemical reaction from VachettaBrowningRemover-2.8 when dry. Tarnish stain from metal accessories contact is also removed with VachettaBrowningRemover-2.8. The above describe the three common class of stain removal. Leather rejuvenating mandatory sequence follows to soften and strength the leather from stiffness that may leads to cracking when flexed. Among leather finishes type, vachetta leathers is the most fatliquor (fat, oil and water) thirsty and will require more fatliquor to soften it then chrome-tanned leathers. In order to lubricate each fibril within the leather structure behaving like millions of interconnecting hinges the fat and oil has to be hydrogen bonded to the fibrils. This is accomplished by preconditioning the leather structure with LeatherHydrator-3.3 effectively prior to faliquor replenishing it with LeatherFatliquor-5.0 in between drying cycle until fully saturated. Natural slow drying in between application produces a softer leather. Protecting the leather with LeatherProtector-D reduces wear to the grain of the leather, conceal scuff with its healing properties that also allows transpiration to take place or breaths naturally. Note that the mentioned products suffix numbers denotes its pH value in this holistic approach to removing the common problems associated with vachetta, saddlery and veg-tan leathers. Concentrates ratio in the bottle reduce shipping weight, thus all 250ml spray bottles have to be cut/mix with distilled water prior to use.