Complex salts derived from the reaction of the double diffused reagents were deposited on the solution specimen?s surface when treated with 40% DAP?s followed by concentration and the second soln.

• 第一液（磷酸氢二铵）药剂浓度40%25与第二液反应后，部份试材表面出现结晶或粉状药剂沉积之现象。