Identification of true and false Takahashi Silver Peak
Four aspects to identify fake tea
1. Observe the appearance: Put a piece of tea in the float plate and open the water for 10 minutes. After the leaves are fully deployed, observe carefully. The edges of the leaves are sharply serrated, and there are glandular hairs on the teeth, and the serrations at the base of the near leaves become thin. The base of the leaf is generally triangular in shape. There is a clear reticular vein on one piece, the main vein is clear, the branch veins are not directly on the edge, and the two-thirds of the leaves are upwardly curved, connecting a vein to form a wavy vein. The tea buds and tender leaves have silvery white hair on the back, and the twigs are cylindrical, that is, true tea, otherwise it is fake tea.
2. Identify the tissue morphology of the tea: Put suspicious tea in a 10% potassium hydroxide solution for 24 hours, then place it in 5:2 water and acetaldehyde solution, and withdraw the color. After fully bleaching the sodium acid, it was placed under a microscope to check the sponge tissue. The calcium oxalate crystals and the dendrite cells were true tea, otherwise false tea.
3, Determination of tea: Select a few pieces of suspicious tea, chopped into a test tube, add the ear 0. 5 ~ 1 ml distilled water to boil, to be cooled, and then processed 0.5 ml record, the test tube vigorous vibration, static layering , Using a thin glass tube to draw a small sample of the bottom of the recorded liquid, placed on the glass after drying, placed under a microscope observation, needle-like crystalline tea is true tea, otherwise it is fake tea.
4, manganese inspection: take a little suspicious tea into the shabu-shabu, burning into ash, with one end of the platinum bent into a small circle, burning a small amount of tea ash after burning, there is a green sodium manganese oxide is the real tea . Then take a small amount of burning ash into a test tube, dissolved with dilute sulfuric acid, add a small amount of nitric acid and a small amount of lead dioxide, put it aside for a while, the upper part of the liquid is purple (permanganate) to prove the presence of manganese, is a real tea.