Here is a colour code conversion chart to convert colour codes between Goldwell, L’oreal, Wella, Schwarzkopf and Indola. A lot of the groundwork for this came from an old handout from my school days. I’d love to give credit but it was unbranded and uncited. It was also very confusing. I hope that my version will clear it up a little and make it slightly easier to read. You have the codes in the box in the right, the small coloured cubes on the left are the base tones of each colour and a little colour star on the last page. In the coming summer months I plan to expand on this and create an app for IOS and Android, so if you have any suggestions drop me a line either in the comments or by email. There is a printable quality PDF document available for download below too, feel free to use as you see fit!