A colour correction is any colour service whose main job is to undo or repair earlier colour rather than simply apply a new shade. Common examples are taking out box dye, evening up patchy or banded lightening, removing unwanted warmth, moving from very dark to light, and recovering from a home bleach. Nobody can tell from a phone call what is already in the hair, so a correction is normally priced at a consultation with a strand test, and it is often done across more than one visit.
In practice
A salon lists a correction consultation at $45 for 30 minutes, taken off the service if the client goes ahead. A client with box-dyed black hair wants a soft brown. At the consultation the stylist plans two sessions: first, four hours of colour removal and treatment at $420; then, three weeks later, two hours of toning and a cut at $210. The written plan totals $630, less the $45 already paid, so $585 across the two visits. The client knows the full figure before any product goes on.
Book corrections with care. A four-hour block on a busy Saturday is a large share of the day, so many salons take a deposit once the plan is agreed and put corrections on quieter days. Allow generous processing time, because rushing lightener is how corrections go wrong. There is a longer walk-through in pricing a colour correction.
In Glow Line
List the correction consultation as its own service with its price, and write in notes that correction prices are set at consultation. The assistant reads that out when a caller asks for a price and never guesses a figure of its own. See services and hours.