20pcs mix colorful heat shrink paper plastic shrink

pastel is an oil-based color painting tool, generally cylindrical or prismatic with a length of about 10 cm. Similar in appearance to crayons, but with stronger adhesion and coverage on the paper surface, it can show the effect of painting.
The pastel has fine hand feeling, smoothness, good spreadability, excellent color stacking and color mixing performance. It can fully display the effect of painting and meet the difficulty of various painting skills. The pastel has fine hand feeling, smoothness, good spreadability, excellent color stacking and color mixing performance. The most prominent ultra-fine thickening coating material makes the coating more textured, and the coating weight is 0.002g/cm2. It can fully display the effect of painting and meet the difficulty of various painting skills. The ultra-low temperature ammonia freezing makes the pressure density higher, the molecular structure of the rod body is more compact, and the weight of a single rod is about 8.5g. The breaking resistance is not less than 4N, and it is more difficult to break and wear.
Oil pastels look like crayons, but they are not. Compared with crayons, pastels have brighter colors, stronger adhesion and coverage on paper, and are one of children's favorite painting tools. There are many kinds of pastels, the brands are domestic and imported; the colors are 12 colors, 16 colors, 25 colors, colors; the models are popular, medium and thick, and so on. (1) The production method of dissolving paraffin with turpentine and saponifying wax;
(2) Paraffin + appropriate amount of linseed + some powder. The production method is the same as that of the pigmented chalk. The ratio of toner to wax is determined according to the degree of absorption of the toner.
Note:
(1) Acetone: available in chemical stores
(2) Raw linseed oil: called green in China, it is the raw material for various varnishes, available in chemical stores
(3) Osmanthus fragrans oil: generally used as a dental medical material
(4) Emulsifying wax: milky white, opaque, yogurt-like, so called emulsifying wax
At the same time, pay attention to the use of pastels, which contain metal components, especially for children; wash hands after use to prevent eating into the stomach with food. 1. Do not place in sunlight or high temperature environment. pastels tend to soften at high temperatures.
2. Do not put it to flammable items.
3. Do not let children swallow, remember to wash hands after painting. pastels are composed of non-drying oils, pigments, calcium carbonate and soft wax. Has excellent softness and strong stickiness. pastel has been introduced into China. Because of its convenience and ease of use and outstanding performance, pastel has become the main material for children's painting, but at the same time, there are many kinds of pastels on the market, and the quality varies, which brings a lot of inconvenience to consumers' purchase. With the continuous expansion of demand, the production of similar products is increasing day by day. Some of the inferior products can be recognized at a glance from their rough appearance, while others have a good color and luster when used, and it is difficult to distinguish the quality from the appearance. It is a harmful substance that exceeds the standard. Experiments have shown that stick paint and rolling paper contain arsenic (As), barium (Ba), lead (Pb), (Hg) and other elements. If the above substances exceed the standard, children will cause chronic poisoning.
If parents are greedy to buy low-quality pastels from street stalls or informal channels, they will increase the chance of lead poisoning. Some people also like to tear off the paper outer skin of the pastel and paint directly with the stick body, but they do not know that if they do not wash their hands well before meals, they will eat lead into their mouths. Once the human body accumulates too much, it will cause harm.
Therefore, when buying pastels, you must go to the stationery counters or stationery stores in regular shopping malls, and choose some pastels with good brand reputation. Because some well-known brands of pastels conform to the pastel industry standards, the safety of children's paints and the content of harmful substances are strictly checked.