10.5 Chemical Relaxers: Products and Application

Chemical Relaxers: Products and Application

Exam Focus: Lanthionization is the single most important concept in this section, because it explains the permanent incompatibility with thio products. The virgin-versus-retouch application order is graded on the New York practical examination, which requires a virgin relaxer on the left front and a 1½-inch retouch on the left back, both using a protective base.

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1. Chemistry of Hydroxide Relaxers & Lanthionization

Hydroxide relaxers are strong alkaline chemical compounds that straighten hair through a unique, irreversible molecular reaction called lanthionization:

┌─────────────────────────────────────────────────────────────────────────────┐
│                        THE LANTHIONIZATION PROCESS                          │
├─────────────────────────────────────────────────────────────────────────────┤
│  1. Hydroxide Ion ($OH^-$) penetrates cortex and attacks Cystine (S-S).     │
│  2. The reaction CLEAVES the disulfide bond and REMOVES ONE SULFUR ATOM.    │
│  3. The remaining sulfur atom bonds to adjacent carbon, forming a           │
│     LANTHIONINE BOND (-S-).                                                 │
│  4. Lanthionine bonds can NEVER be reformed by neutralizers or oxidizers.   │
│  5. Hair relaxed with hydroxide can NEVER be treated with Thio perms!       │
└─────────────────────────────────────────────────────────────────────────────┘

Disulfide Bond Cleavage vs. Lanthionine Cross-links

In permanent waving, disulfide bonds ($S-S$) are reduced into two cysteine sulfhydryl groups ($-SH$) and subsequently reformed into disulfide bonds by hydrogen peroxide. In contrast, hydroxide relaxers permanently alter the bond chemistry:

• The hydroxide ion ($OH^-$) strips a sulfur atom entirely out of the cystine molecule.
• The resulting cross-link contains only one sulfur atom instead of two, forming lanthionine (a thioether cross-link).
• Because lanthionization permanently eliminates the second sulfur atom, neutralizing oxidizers cannot rebuild the original disulfide bonds.
• Hydroxide-relaxed hair permanently loses approximately one-third of its original elasticity and tensile strength.

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2. Comprehensive Classifications of Chemical Relaxers

┌─────────────────────────────────────────────────────────────────────────────┐
│                     SPECTRUM OF CHEMICAL HAIR RELAXERS                      │
├─────────────────────────────────────────────────────────────────────────────┤
│  1. Sodium Hydroxide (Lye)      ──> pH 12.5–14.0; fastest; high irritation  │
│  2. Guanidine Hydroxide (No-Lye)──> pH 13.0–13.5; 2-part mix; less burn, dry│
│  3. Lithium / Potassium Hydroxide─> pH 12.5–13.5; no-mix no-lye; effective  │
│  4. Ammonium Thioglycolate(Thio)──> pH 9.0–10.0; reduction/oxidation perm   │
└─────────────────────────────────────────────────────────────────────────────┘

Detailed Chemical Formulations

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3. Base vs. No-Base Relaxers & Relaxer Strengths

Base vs. No-Base Relaxers

• Base Relaxers: Require the application of a protective petroleum-based base cream over the entire scalp, perimeter hairline, ears, and nape before applying the relaxer.
• No-Base Relaxers: Contain a protective oil base built directly into the cream formulation that melts at body temperature and deposits onto the scalp during processing. However, state board safety standards require applying protective base cream around the entire hairline, ears, and nape regardless of whether the product is labeled base or no-base.

Relaxer Strengths

• Mild Strength: Formulated for fine, color-treated, porous, or chemically highlighted hair.
• Regular / Normal Strength: Standard formulation for medium-textured hair with normal elasticity and wave pattern.
• Super Strength: Formulated for coarse, virgin, extremely coiled, and highly resistant hair.

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4. Clinical Relaxer Application Protocols

┌───────────────────────────────────┐     ┌───────────────────────────────────┐
│      VIRGIN RELAXER PROTOCOL      │     │      RETOUCH RELAXER PROTOCOL     │
├───────────────────────────────────┤     ├───────────────────────────────────┤
│ • Scalp: 1/4 to 1/2 inch away     │     │ • Apply ONLY to new growth area   │
│ • Ends: Stop 1 inch before ends   │     │ • Stop 1/16 inch before old line  │
│ • Process mid-shaft first         │     │ • NEVER overlap onto previously   │
│ • Apply to scalp & ends last      │     │   relaxed hair (prevents breaks)  │
│   (body heat & porosity accelerate│     │ • Smooth new growth with comb back│
│    processing in these zones)     │     │ • Rinse thoroughly & neutralize   │
└───────────────────────────────────┘     └───────────────────────────────────┘

1. Virgin Relaxer Application (Hair Never Relaxed Before)

1. Section hair into 4 quadrants.
2. Apply protective base cream to scalp, perimeter hairline, ears, and nape.
3. Take 1/4-inch to 1/2-inch subsections.
4. Apply relaxer with brush or fingers starting 1/4 inch to 1/2 inch away from the scalp, extending through the mid-shaft and stopping 1 inch before the ends.
5. Once the mid-shaft begins to relax, apply product to the scalp area and porous ends last. Scalp body heat accelerates chemical action, while porous ends absorb product rapidly.

2. Retouch Relaxer Application (New Growth Only)

1. Apply base cream to scalp and hairline.
2. Apply relaxer cream strictly to the new growth area (from 1/4 inch away from scalp up to the line of demarcation).
3. CRITICAL WARNING: Never overlap relaxer onto previously relaxed hair. Overlapping causes severe chemical overprocessing, localized thinning, and hair breakage at the line of demarcation.

Smoothing Mechanics

After application, the relaxer is smoothed using the back of a hard rubber tail comb or gloved fingers in rhythmic, downward strokes. Never use the teeth of the comb to pull or stretch relaxing hair, which shreds the fragile cuticle layer.

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5. Rinsing, Neutralizing Shampoo & Normalizing Protocols

┌─────────────────────────────────────────────────────────────────────────────┐
│                     RELAXER RINSING & NEUTRALIZATION                        │
├─────────────────────────────────────────────────────────────────────────────┤
│  1. Thorough Warm Water Rinse: Rinse hair for at least 5 minutes to flush   │
│     all active relaxer cream from the hair shaft and scalp.                 │
│  2. Neutralizing Shampoo: Apply acid-balanced neutralizing shampoo          │
│     (pH 4.5–6.0) with built-in COLOR INDICATOR.                             │
│  3. Color Indicator Mechanism: Lather turns PINK in presence of alkaline    │
│     hydroxide residue; turns WHITE when hair is fully neutralized.          │
│  4. Multiple Shampoos: Continue shampooing until lather is COMPLETELY WHITE │
│     (minimum 3 to 4 latherings).                                            │
│  5. Normalizing Conditioner: Apply deep acidic normalizing treatment to     │
│     restore natural acid mantle (pH 4.5–5.5) and seal cuticle scales.       │
└─────────────────────────────────────────────────────────────────────────────┘

State Board Essential: Incomplete neutralization leaves active hydroxide trapped inside the cortex, leading to continuous chemical degradation, severe breakage days after the service, and chemical scalp ulceration.