Pressure of the water samples more often want to change 2 to 3 times a day, once a day can be changed after the third day, you can change a few days later, until dry. Case of rainy weather, the specimen is easy to mold, change the paper more important. The first few pay attention to shaping the folds of leaves, flowers spread out, demonstrating the main features. Should be promptly replaced the wet paper dried or drying. Drying heat exchange with the paper better. When you want to change the paper gently, first remove the specimen on wet paper, put on a few dry paper, then pressed a hand specimen above dry paper, the other hand, hold the specimens under wet paper quickly Flip, and the dry side of the paper turn under, on top of a wet paper turn, then remove the wet paper herbarium specimens, put on dry paper Hebei herbarium specimens, thus reducing the specimen movement, to avoid damage. ② red specimen production. Some, such as tomatoes and other red fruits washed with 4 ml first immersed in formalin, 3 g of boric acid and 400 ml of water treatment solution dubbed, about 1 to 3 days after the fruit that turns brown Xuchang herbarium specimens, then you can take out a small amount of fruit to the inside injected with 20 ml of 10% sodium sulfate, 10 g of boric acid and 580 ml of water from the preparation of the preservation solution, followed by a long soak the fruit in such a preservation solution, gradually restored to original red. ③ purple specimen production. Purple grapes and other fruits washed first in 250 ml of formalin, 500 ml of saturated sodium chloride solution, combined with 4350 ml of distilled water into a treatment liquid immersed 2 to 3 months, after removing wash Puyang herbarium specimens placed in 1% to 2% formalin solution for long term storage. ④ white specimen production. The other white flowers with roots washed and placed in 1% to 4% of the sulfite solution, and then placed under the sunlight for a long time, until the specimen into a snow drift in white sun. Puyang herbarium specimens _ _ voyage teaching herbarium specimens provided by Xinxiang City Teaching Equipment Co. voyage. Xinxiang City voyage Teaching Equipment Co. (www.xxyuanhang.cn) strong, credible, in Xinxiang specimen model industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the voyage into the brilliant teaching and you work for a better future!