IL Cosmetology study guide
IL Cosmetology · Work through your exam, one topic at a time.
The Illinois Cosmetology licensure credential is the state-issued license that allows a graduate of an approved cosmetology program to legally perform hair, skin, and nail services for the public in Illinois. It is administered through the state licensing authority, and candidates typically qualify by completing the required clock hours at an approved school and then passing both a written theory examination and a hands-on practical examination. The IL Cosmetology study guide has 12 sections and about 3,318 words.
01Safety, Sanitation, and Infection Control
Cleaning removes visible debris with soap and water. Sanitizing reduces bacteria to a safe level.
310 words, about 2 min02Illinois Cosmetology Law and Administrative Rules
Illinois regulates the industry under the Barber, Cosmetology, Esthetics, Hair Braiding, and Nail Technology Act of 1985 (225 ILCS 410), administered by the Illinois Department of Financial and Professional Regulation (IDFPR), with sanitation rules in 68 Ill. Licensing is tiered: cosmetologist (hair, skin, and nails), esthetician (skin only), nail technician (nails of hands and feet only), hair braider (braiding only), and teacher.
317 words, about 2 min03Anatomy, Physiology, and Histology of Hair, Skin, and Nails
Study the hair shaft from the outside in: cuticle (overlapping scales that protect and that chemicals must open), cortex (largest layer, holds melanin and the disulfide bonds that perming, relaxing, and coloring change), and medulla (innermost core, which may be absent in fine or light hair). The follicle sits in the dermis with a sebaceous gland, arrector pili muscle, and papilla that supplies nutrients.
283 words, about 1 min04Chemistry, Product Knowledge, and Product Safety
Matter is made of atoms, elements, and compounds. Know the difference between a solution (evenly mixed, will not settle), a suspension (particles settle, must be shaken), and an emulsion (two immiscible liquids held together by an emulsifier - most lotions and creams).
269 words, about 1 min05Hair and Scalp Care, Shampooing, and Treatments
Every service begins with hair analysis: texture (fine, medium, coarse), density , porosity (how readily hair absorbs moisture - low, normal, high), elasticity (stretch and return, reflecting protein/moisture balance), growth pattern, and scalp condition. High porosity hair grabs color and chemicals fast and can overprocess; low porosity resists.
259 words, about 1 min06Haircutting and Hair Shaping
Haircutting is controlled by four variables: sectioning, elevation (angle), distribution, and guide . Elevation: 0 degrees builds a blunt, solid line; 45 degrees graduates; 90 degrees creates a uniform layer; 180 degrees produces long-layered, shag shapes.
261 words, about 1 min07Hairstyling, Thermal Styling, and Wigs/Extensions
Wet styling relies on hydrogen bonds: roller sets (base, stem, curl; larger rollers give volume, smaller give curl), pin curls (flat or barrel, clockwise or counterclockwise), finger waves, and blow-drying with a round brush. Thermal styling changes the hair temporarily through heat.
286 words, about 1 min08Chemical Texture Services (Permanent Waving and Relaxing)
Perms break disulfide bonds with a reducing agent, reshape the hair on a rod, then rebuild the bonds with a neutralizer (sodium bromate or hydrogen peroxide). Ammonium thioglycolate is alkaline (about pH 9-9.5), swells the cuticle, and processes quickly; glyceryl monothioglycolate is acid-balanced (about pH 6.5-7.2), gentler and slower.
265 words, about 1 min09Hair Coloring and Lightening
Levels run 1 (black) to 10 (lightest blonde). Melanin is eumelanin (brown-black) or pheomelanin (red-yellow), and the underlying pigment you must neutralize follows the level.
295 words, about 1 min10Skin Care, Facial Treatments, and Makeup
Identify skin type (normal, dry, oily, combination, sensitive) and current condition. A basic facial follows cleansing, analysis, exfoliation, massage, mask, moisturizer, and sun protection, with a client record and consent.
258 words, about 1 min11Nail Care, Manicuring, and Pedicuring
Review nail anatomy: plate, bed, matrix, lunula, eponychium, hyponychium, sidewalls, free edge. Manicuring follows consultation, sanitation, shaping, cuticle care, massage, and polish.
261 words, about 1 min12Salon Business, Client Consultation, and Professional Practices
A consultation covers the client's history, previous chemical services, allergies, medications, lifestyle, and goals, plus a patch or strand test when indicated. Explain realistic outcomes, obtain consent, and record everything - service performed, products, processing time, and recommendations.
254 words, about 1 min