Paint environmental protection not environmental protection Do not just listen to the salesman, learn a few simple ways to identify yourself, so you can avoid being fooled: look at the paint surface, check the paint layering, check the product quality inspection report, and consult the merchant about paint brushing Numbers and painting areas can achieve simple identification. 1. Look at the surface of the paint. High-quality and colorful coatings The protective rubber solution layer is colorless or yellowish, and clear, the surface is usually free from floating objects; if there are floating objects, you must purchase it with caution. Non-environmentally-friendly paints have excessive odor due to harmful substances such as VOC and formaldehyde, smelling pungent odors in paint, toxic paints may not taste, but paints with strange smells must have problems. Consumers need to buy carefully. Of course, do not buy products that smell very fragrant. In general, these types of paints have added flavors. The additives themselves are chemical products and it is difficult to ensure environmental protection. 2. If possible, ask the seller to open the paint bucket and test it in person. If the paint has serious stratification, it means that the quality is poor; after stirring gently with the stick and lifting it, the paint stays on the stick for a long time and the coverage is even, which means that the quality is better; the lighter the hand, the finer the better. No problem with the paint distributors, the use of open-lid sales methods, allowing consumers to intuitively paint the environmental protection. 3. Carefully review the product quality inspection report, paying particular attention to the total organic volatile content (VOC) of the paint. Organic volatiles pose a great danger to our home environment and to ourselves. Toluene, xylene, butanone, acetate, etc. are among the limitations, and we should minimize the amount of these solvents. 4. Less consumption consumption: consult the merchant about the number of painting times and the area of ​​painting, the calculation amount and the cost per square meter of material, not be deceived by the unit price of each group (barrel), paint from solid parts Membrane) and volatile matter composition, high solid content of 70% to 80%, low of less than 10% to 20%, low unit price is often very large consumption, costing more expensive and wasteful, and quality effect difference. Paint coating buy three trees paint paint paint formaldehyde
The cover glass is covered on the material on the glass slide, which can avoid the contact between the liquid and the objective lens, so as not to contaminate the lens, and can make the top of the observed cells in the same plane, that is, the distance from the objective lens is the same, so that the observed Images are clearer.Why do you need a coverslip when using a microscope
The purpose of staining the specimen with iodine solution is to make the cells more obvious under the microscope, and it can also kill the cells and prevent the cells from migrating.
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2. Make the specimen relatively fixed;
3. It is convenient to use the capillary phenomenon to form a gradient when adding various reagents (staining agent, acid, salt solution);
4. Avoid contamination of the specimen.
