问：如何通过目测来识别淀粉的优劣？（河南某淀粉经销商）
答：用目测可识别淀粉的优劣。优质淀粉的特征是粉色洁白，有光泽，拍打装粉的布包，即可见粉尘飞扬，成把紧捏时，粉尘从指缝外喷，松手时，即全部松散，手捻小块很容易松碎，手摸表面感到细腻光滑，且不粘手指。将适量淀粉用沸水冲调后，应该为褐色且微有透明。把水放在玻璃杯内用冷水充分搅，沉淀后水面应无浮皮，水底无泥沙，粉质纯净，粉块坚硬，细腻，光滑，入口细嚼，没有牙碜和异味。劣质淀粉的特征是粉白灰色，粉粒不匀，手感粗糙。捏搓没有声响或声响不大，成把紧捏时粉尘外喷，放手后不易散开，手插入粉袋中，中心发热，用沸水冲调后，呈深灰色带黑。加冷水搅拌后，水面见浮皮，下有泥沙，粉块、松软，嘴嚼有牙碜感。
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