As the silica gel can deepen the color of the test solution, the optical density is increased.
2
皮肤点刺试验：在受试者前臂皮肤上滴上一滴含有疑似过敏原的溶液，然后用针刺。
The skin-prick test: a drop of a solution containing the suspected allergen is placed on the skin of the subject's forearm, which is then pricked with a needle.
3
醋酸白试验：即用5%醋酸溶液外搽或湿敷患处，3 ~ 5分钟后，病灶局部变白且境界清楚者为阳性。
Acetowhitening test: 5% acetic acid solution Waicha or wet dressing, 3 ~ 5 minutes later, the local white lesions were positive and clear boundary.
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