Bleach, Demi-Gloss and Keratin Compatibility Matrix

Sequencing Synthesis

Always complete alkaline lightening before glyoxylic or cysteine keratin smoothing, never immediately after. High-heat flat-iron sealing (190 to 230 C) strips freshly deposited demi-permanent toners by up to two levels and locks an occlusive hydrophobic polymer over the cuticle that blocks future hydrogen peroxide penetration for 30 to 45 days.

Calibrated salon hair color swatch locks arranged from Level 2 espresso through Level 6 copper to Level 9 champagne blonde on pearl stone with brass clips — Plate 02: Calibrated chromatic reference arc from Level 2 espresso to Level 9 champagne blonde used to audit post-smoothing warm pigment shift.

Chemical Service Comparison Matrix

Metric / Parameter	Persulfate Bleaching	Acidic Demi-Gloss	Glyoxylic Keratin	Thio Alkaline Perm
Active Chemistry	Ammonium/Potassium Persulfate + H2O2	Low-MEA Pre-Coupled Dye + 6V-10V	Glyoxylic Acid / Carbocisteine	Ammonium Thioglycolate + H2O2
Formulation pH	9.5 - 10.8 (High Alkaline)	5.8 - 6.8 (Mildly Acidic)	1.8 - 2.6 (Strong Acidic)	8.8 - 9.4 (Alkaline Reductive)
Thermal Requirement	Ambient or Controlled 35 C max	Ambient 20-25 min	190 - 230 C Flat Iron Seal	Ambient (No Direct Heat)
Disulfide Bond Impact	15-30% oxidation to cysteic acid	<2% surface impact	Creates methylene/imine cross-links	Cleaves & reforms 25-40% S-S
Pigment Retention	Permanent melanin removal	18 - 24 shampoos	Shifts cool ash 1-2 levels warmer	Lifts oxidized dye 0.5-1 level
Bond Builder Compatibility	Essential (In-Bowl)	Post-Step Seal	Optional Pre-Treatment	Essential (In-Lotion)

Service Sequencing & Waiting-Interval Checker

Two-Process Safety Check

First Service (Already Performed)

Proposed Second Service

Minimum Wait Window 10-14 Days Minimum

pH / Thermal Shift pH 9.8 -> pH 2.4 Shift

Persulfate bleaching opens cuticle scales and oxidizes disulfide bonds. Performing acidic glyoxylic keratin smoothing the same day at 230 C causes amber pigment shift and thermal cuticle snapping.

Thermal Iron Calibration on Highlighted Copper and Blonde Fibers

One of the most frequent salon post-keratin surprises is sudden orange or brassy reversion on balanced beige or copper-ash hair. At 230 C, acidic glyoxylic condensation oxidizes residual aromatic dye precursors inside the upper cortex. When smoothing porous pre-lightened zones (Level 8 to 10), capping iron temperature at 185 to 195 C and using fewer pass strokes preserves tensile snap resistance and leaves a predictable canvas for an acidic demi-permanent gloss seven days later.

For specific peroxide volume dosing prior to glossing, use the Developer and Pigment Formulator, or review internal disulfide mechanics in Cuticle Porosity Chemistry.