菠莱籽　新种子表皮为黄绿色，鼻嗅有清香味。剥开种籽，内部淀粉为白色。陈种子皮皮黄色，鼻嗅有霉味，剥开种子，内部淀粉为灰色。 黄瓜籽　新种子表皮有光泽，为乳白色或白色，毛刺较尖。将手插入种子中拔出时，手上往往挂有很多种子。陈种子表皮无光泽，常有黄斑，毛刺较钝 Spinach new seed epidermis is yellow-green, sniff smell fragrance. Peel the seeds, the internal starch is white. Chen seeds yellow skin, nose smell musty, stripped of seeds, the internal starch is gray. Cucumber seed new seed epidermis shiny, milky white or white, burr more sharp. When the hand is inserted into the seed and pulled out, a lot of seeds are often hung on the hand. Chen seeds epidermis dull, often macular, burr more blunt