Loreal Inoa Ammonia Free ODS2 Hair Color 60g/2oz (4,0) aka 4.0/4NN permanent color with ODS2 technology with uncompromised comfort. Lightens up to 3 levels in 35 minutes. Covers up to 100% of white hair. These color tubes are imported from Europe and display in European System of shade numbers. They contain the same color as US counterpart. The European shade number is listed first, as it appears on the package; matching US shade is listed after "aka" which is an abbreviation for Also Known As. New Trend Beauty supplies salons across the country and no difference in color, consistency, or feeling on scalp has been noticed by professionals or customers.