Every corrective decision comes down to one question: what is opposite the thing I am looking at.

Clients do not compare colour services. They compare numbers.

Most colour menus are a list of products with prices, which is the one thing a client cannot use.

A tube costs £3.49, so waste feels like it cannot matter. Across a year it does.

Nothing is expensive, so nothing feels urgent — until the shade you needed runs out on a Saturday.

A hundred and sixty variants is a range, not a shopping list.

Knowing where a product stops is part of knowing how to use it.

Three ratios in one range, and which you need is decided by the service rather than by habit.