10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
These 10 free CRT questions are organized by exam domain, so you can see how each part of the Color Repair Technician (CRT) blueprint is tested. Reveal the answer and explanation under each question.
An owner assumes that a wool rug dated 1890 must contain natural dyes because it predates the twentieth century. Which nineteenth-century synthetic colorant provides a historical counterexample?
Correct answer: C - Mauveine
Under identical CIELAB measurement conditions, a dry repair and its reference both have L* = 60.0 and b* = +12.0. The reference has a* = +6.0; the repair has a* = +2.5. Which statement correctly describes the repair's position on the red-green axis?
Correct answer: B - It is greener relative to the reference, although both a* coordinates remain positive.
A product marketed as a 'natural carpet dye' contains dispersed, insoluble colored particles and a film-forming binder. A wool test patch reaches the desired shade but feels stiff after drying. Which description best fits the treatment?
Correct answer: C - Surface pigmentation, with the binder holding particles on the tufts.
Intact carpet yarns have alternating tan and blue segments, but a bleach-damaged area has lost that pattern. After bleach deactivation and removal, a uniformly recolored trial matches the intact carpet's CIELAB readings when the instrument samples many tufts together, yet looks like a solid patch. Both areas are fully dry and groomed alike. What explains this failure despite the measured color match?
Correct answer: D - Loss of the local color arrangement along the original space-dyed yarns.
Wool is a protein fiber and nylon is a synthetic polyamide, yet both can accept suitable acid dyes. Which interaction helps explain this shared dye affinity under appropriate acidic conditions?
Correct answer: D - Attraction between positive amino sites and negatively charged dye ions.
A customer was advised to replace stain-blocked nylon carpet after a small bleach spill. Inspection finds sound pile and backing, and the bleach has been deactivated and removed. A dye specified for stain-blocked nylon gives a representative trial that matches when dry and passes the manufacturer's transfer check. The customer wants to preserve the carpet if a lasting spot repair is feasible. What should the CRT recommend?
Correct answer: A - Complete the local repair with the demonstrated formulation and application conditions.
Viewed from the doorway, a clean, dry Saxony carpet has a pale patch shaped like a water spill. From the opposite side of the room, the patch looks darker than its surroundings. The light source has not changed, and the affected pile leans in a different direction. What accounts for this reversal?
Correct answer: A - The changed pile direction alters reflection from the yarn sides and tips.
A bleach spot on sound nylon carpet has been neutralized and cleaned. After a controlled dye application and drying, its edge matches the surrounding carpet, but the center is still too pale. The center has the correct hue, and the repair method permits further localized additions. How should the technician complete the match?
Correct answer: C - Build color in the center, feathering to zero at the matched edge.
A successful 50 mL trial used 10 mL of blue stock at 2.0 g/L, 10 mL of yellow stock at 2.0 g/L, and 30 mL of water. The replacement blue stock contains the same dye at 4.0 g/L; the yellow stock is unchanged. With compatible solutions and additive volumes, which 100 mL trial preserves the concentration of each dye?
Correct answer: A - 10 mL blue stock, 20 mL yellow stock, and 70 mL water.
During indoor spot treatment, an acidic cleaner is accidentally applied where chlorine bleach remains in the carpet. An irritating odor develops, and the technician begins coughing and feels chest tightness. Which response takes priority?
Correct answer: B - Leave for fresh air, keep others out, and call emergency services.
The CRT exam also covers these domains. Drill them in the full free practice test:
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