Guided Wave, Inc.

APHA Color

Purpose: Measurement of APHA color either on-line or in a laboratory setting using a photometer.Background: APHA is sometimes referred to as the Platinum-Cobalt (Pt/Co) or Hazen scale. Also referred to as a “yellowness index”, the APHA color scale is a common method of com-parison of the intensity of yellow-tinted samples to assess the quality of ...