CO Cosmetology study materials
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CO Cosmetology: Nail Technology (Manicuring)

CO Cosmetology · Work through your exam, one topic at a time.

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Nail Technology (Manicuring)

Nail technology covers manicuring, pedicuring, nail structure and disorders, artificial enhancements, and the disinfection rules that separate a compliant salon from a risky one. Exam items often present a client scenario and ask what you may do; the answer is grounded in nail anatomy and in what can and cannot be disinfected.

Nail anatomy

  • Plate (visible body), bed (under the plate), matrix (where cells are produced - damage here permanently deforms the nail), lunula (visible half-moon of the matrix), free edge, eponychium (living tissue at the base), cuticle (non-living seal on the plate), hyponychium (seal under the free edge), sidewalls and nail folds.
  • Fingernails grow roughly 1/8 inch per month and take four to six months to replace; toenails take nine to twelve months.

Manicure protocol

  • Shape with a fine-grit file in one direction, corner to centre; sawing back and forth splits the free edge.
  • Soften the cuticle, push it back gently, and trim only hangnails with nippers. The cuticle seals the nail; nipping living tissue invites paronychia.
  • Then buff lightly, massage, and apply base coat, two thin colour coats, and top coat.

Disinfection

  • Clean implements with soap and water, then immerse in an EPA-registered hospital-grade disinfectant for the full label contact time.
  • Porous items - files, buffers, wooden sticks, cotton - cannot be disinfected and must be discarded or given to the client.
  • Pedicure basins are scrubbed, then disinfected with a hospital-grade product after every client; screens and jets are cleaned as the label directs.
  • Methyl methacrylate (MMA) monomer is restricted or prohibited for artificial nails; use ethyl methacrylate (EMA) products as labelled.

Disorders to refer

  • Onychomycosis (fungal), paronychia (bacterial redness, pus, swelling), and green discolouration from Pseudomonas are infections: apply no product, refer, and disinfect everything.
  • Non-infectious: onycholysis (lifting), onychorrhexis (splitting), Beau's lines (stress grooves), koilonychia (spoon nails), leukonychia (white spots).

Worked example

A client arrives with green-black staining under a lifted acrylic. Reason it out: the discolouration suggests Pseudomonas growing in the moist pocket - an infection, not a stain. Remove the product, do not reapply, refer to a physician, and disinfect all implements with the hospital-grade product.

Traps that cost marks

  • Filing the natural nail back and forth.
  • Reusing a porous buffer or double-dipping cream.
  • Cutting the cuticle instead of pushing it back.