Prepare specimens commonly used preservative fixed drug, what disadvantages? Glycerin: glycerin plant specimens generic label, is a colorless, transparent, odorless, viscous liquid with a sweet taste. Disadvantages: a poor low concentrations of glycerol permeability, preparation plant specimens collected mixed corrosion fixative, and also reduce the rate of penetration of other drugs. Processed specimens take longer to apply. 2. High concentrations of glycerol, viscous, and have a great resistance to injection. Glycerol produced herbarium specimens, sticky slippery stagnation, inconvenience anatomical operation. To make up for the shortcomings of poor permeability of glycerol, polyols from someone finds a better penetration of sorbitan alcohol instead of glycerin plant specimens pictures, it is shared with an alcohol-based solution, will enhance the penetration penetration properties. What is the type specimens according to new species, new varieties or subspecies of the original records and naming new specimens, is called type specimens. The type specimens are the following: 1) Master Mode specimen 2), etc. The type specimen 3) co-type specimen 4) specimens after the election mode 5) Vice type specimen 6) New type specimen 7) Origin mode herbarium specimen collection which generally requires appliances? Tools: specimen folder (with slats nailed to grow to about 43cm, width 30cm of two plywood), collecting box (70 × 50cm now use more plastic bags or backpacks), a small hoe, T small picks, sticks and scissors Lopper, handsaw, plastic jars, alcohol, formalin (formaldehyde), absorbent paper (easy-absorbent toilet paper or old newspapers), number sign, field recording sign, naming sign (specific style attached), collection bags, small bags, pencil measurement tools: a magnifying glass, empty box barometer (altitude meter), global positioning system (GPS) for observing the direction and slope, compass, steel tape measure, measuring tape, a camera (with telephoto) or digital cameras, binoculars, maps, other coarse, fine linen, plastic sheeting, lighting equipment, rain gear, the size of the bag, snake medicine and general emergency medicine, and other reference books. Herbarium crafts, Zhejiang plant specimens, teaching voyage by voyage Teaching Equipment Co., Ltd. Xinxiang City. Xinxiang City voyage Teaching Equipment Co. (www.xxyuanhang.cn) (www.yuanhang369.com) 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! You can also access (www.yuanhang369.com/supply_details_44549620.html), for more information about the company.