Busting hair care myths! Build-up, silicones and more AD

Main ideas / concepts covered

• Hair “scrape tests” are misleading

  • A test popularized by 5 Minute Crafts—scraping off white residue with scissors to “prove” buildup—is not a reliable way to determine whether hair products leave harmful residue.
  • The host conducted an experiment using clarified hair (washed with clarifying shampoo) and tested it with and without conditioner.
  • Result: white residue appeared on both samples, indicating the residue was not clearly caused by conditioner/buildup.
  • Microscopy suggests much of the scraped material is cuticle damage (“roof shingle” cuticle fragments), and the test can cause damage that looks like residue.
  • Conclusion: scraping hair mainly produces split ends / physical damage, not a trustworthy measure of product buildup.

• Conditioners necessarily leave deposits, but the “build-up” you fear is usually not visible

  • Hair is dead once it emerges from the scalp; the only living part is the hair bulb inside the scalp.
  • Over time (growth is ~14 cm/year), the hair accumulating at length near the ends has experienced brushing, washing, sun, heat styling, etc.
  • Damaged cuticle surfaces lead to roughness; attempting to “sand it down” worsens damage.
  • Conditioning works by filling gaps/weak spots and smoothing hair, helping restore a more intact-like feel and strength.
  • Mechanism (cationic conditioning):
    • Conditioners contain cationic surfactants (positively charged) such as:
      • cetrimonium chloride
      • behentrimonium chloride
      • distearyldimonium chloride
      • stearamidopropyl dimethylamine
    • In conditioner’s acidic pH, these act via electrostatic attraction (adsorption):
      • wet hair becomes negatively charged
      • positively charged conditioner components stick to hair
      • the surfactant’s oily portion lubricates, smooths, and reduces static
  • Other conditioning ingredients may include:
    • polyquaternium polymers
    • hydrolyzed proteins
    • oils
    • silicones
  • Key claim: what remains on hair is typically microscopic, and generally not something a scrape test can accurately measure.

• “Drugstore vs salon” and “silicones build up” are oversimplifications

  • Myth: drugstore conditioners leave buildup vs salon ones don’t.
    • Reality: all conditioning products leave something because that’s part of how they work.
  • Myth: “Silicones always weigh hair down.”
    • Reality: silicones are highly diverse; different silicones behave differently.
    • Whether a product seems heavy/greasy depends on compatibility with your hair type and how you use it.

• Hair type compatibility drives whether a conditioner feels good

  • Factors influencing how much conditioning ingredient stays on hair:
    • the ingredient itself
    • concentration in the formula
    • how you use the product
    • hair properties (porosity, texture, etc.)
  • Misperception explained:
    • Using a conditioner designed for coarse/resistant hair on fine/porous hair can cause over-deposition, leading to hair that feels greasy/lank/sticky to dust.
  • Personal anecdote:
    • After bleaching, a conditioner with lots of dimethicone that previously worked well became limp and greasy—the issue was attributed to mismatch with changed hair type, not that “silicones are bad.”

• Silicones are not one thing

  • “Dimethicone” can refer to different silicone structures.
    • Different silicone types and variants can have different charges and molecular structures.
  • Example:
    • Amodimethicone and bisaminopropyl dimethicone are described as positively charged, which tends to:
      • reduce excess deposition
      • increase repulsion between silicones once enough is present
  • Another explanation:
    • Dimethicone “grades” vary by polymer length:
      • longer chains can feel thicker/heavier
      • shorter chains can feel lighter and spread more easily
  • Bottom line: reading a label alone may miss important nuance—“silicone” isn’t a single category.

• How to choose conditioners

  • Instead of blanket rules like “avoid silicones,” the host recommends:
    • choose based on the product’s intended hair type
    • read reviews from people with similar hair
    • test it on your own hair
  • Moral of the story:
    • There are “hundreds and thousands” of silicones and many ways they’re used.
    • A bad experience with one silicone-containing product doesn’t mean all silicones are bad.

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Methodology / experiment described (detailed steps)

• Goal: Test whether white residue from a “scrape test” reflects true conditioner/silicone buildup.
• Materials / preparation:
  • Take two hair samples.
  • Wash both samples with clarifying shampoo intended to remove buildup.
  • Repeat clarifying washing twice to ensure hair is thoroughly clarified.
• Conditioner application:
  • Apply Pantene conditioner to only one sample.
  • Leave the other sample without conditioner.
• Drying process:
  • Blow-dry both samples to about 90% dryness.
  • Then air-dry both samples.
• Scrape test procedure:
  • Scrape the hair samples (following the concept described by the myth/test).
  • Record the amount and character of white residue collected.
• Microscopy / observation:
  • Use a handheld microscope to inspect residue and hair structure.
  • Interpret residue structurally:
    • the white residue is suggested to be cuticle fragments (“roof shingles”), not necessarily conditioner buildup.
• Conclusions drawn:
  • White residue appeared even on clarified hair with no conditioner.
  • Therefore, the scrape test is not a valid indicator of product buildup.
  • Scraping causes damage (e.g., split-end-like effects).

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Speakers / sources featured

• Michelle (Lab Muffin Beauty Science) — host/primary speaker and experimenter
• 5 Minute Crafts — referenced as the origin/popularizer of the scrape-test myth (not shown as a direct speaker)
• Pantene — sponsor mentioned; “Pantene scientists” are referenced for microscopic imaging context