News & Announcements
News & Announcements
2026-07-22
What sun, salt, and chlorine do to colour-treated hair
Every summer we see the same pattern: clients come in after a holiday with colour that has shifted in ways they did not expect. The brassiness, the dullness, the unexpected warmth at the mid-length. Most of it is predictable once you understand what is happening at the level of the hair shaft.
Read more →2026-07-20
Balayage vs highlights: what actually changes
Clients ask us this question at least twice a week. Both services lighten the hair. Both use bleach or a high-lift colour. But the way the product is applied, the tools used, and the result you live with for the next six months are genuinely different. Getting the distinction right before you book saves time, money, and a lot of disappointment.
Read more →2026-07-05
Colour correction: what to expect before you book
Colour correction is the service we get the most enquiries about, and the one where expectations most often need to be managed carefully. Not because the results are bad, but because the gap between what a client hopes for and what is safely achievable in one session is often significant. This is an honest account of how correction work actually goes.
Read more →The person
The person behind
Fiona Caldwell
Founder, Established since 2017
Fiona Caldwell trained at the Vidal Sassoon Academy in London before spending four years as a senior colourist at a well-regarded salon in London. She moved back to Tokyo in 2016 and opened Copper Glacier the following spring, drawn by the idea of building a slower, more considered practice than the high-volume city floor she'd come from. She holds advanced certifications in Balayage and Olaplex bond-building treatments, and she still takes every new client consultation herself. Outside the salon, she grows dahlias and is quietly obsessed with the chemistry of hair pigment.