Does anyone know whether different color processing chemicals are used in the Tetenal 5 liter mono kit and the professional 13.5 liter kits? I'm used to using the mono kit and mixing the color developer for it results in a deep umber colored liquid with that familiar photo-lab smell. Mixing my first color developer for the 13.5 liter kit (which I bought by mistake - Doh!) resulted in a weak golden solution that doesn't smell much like anything. Could something be wrong here?