Same as the permanent, LEVEL + LETTERS: 9NA = level 9, natural ash (Light Natural Ash Blonde).
- N neutral, the base for gray.
- A ash, to cut warmth.
- G gold and WG warm gold.
- CB cool blonde (cool beige).
- RR intense red, VV intense violet and BBL blue black.
One to watch: 7RR carries intense-red letters and sits in the red family, but Wella names it Light Copper, so the converter treats it as a red copper.
Watch the adjectives: in the browns, Wella names the demi one step lighter than the permanent for the same number (4N is Light Neutral Brown in the demi and Medium Brown in the permanent). Go by the number, not the name.