Figure 2From: Alkaptonuria diagnosed in a 4-month-old baby girl: a case reportQualitative assay of homogentisic acid: To 0.5 ml of sample few drops of 10% ammonia was added followed by addition of 3% silver nitrate solution. Development of greenish black color signified presence of substantial amount of homogentisic acid. The test tube in the centre is the control one.Back to article page