1. Look at the water solubility. The art painting has been preserved for a long time, and the particles of the pattern will sink. There will be an aqueous solution of protective glue. The protective glue aqueous solution layer accounts for about 1 / 4 of the total amount of art coatings. Therefore, in high-quality art coatings, the aqueous solution of protective glue is colorless or light yellow and very clear. When using lower grade coatings, the aqueous solution of protective glue is turbid and shows the same color as the pattern color particles. The main problem is that the stability of coating or storage is poor, which is outdated and should not be used again.

2.看漂浮物，高質量的藝術繪畫，表面沒有漂浮物，如果漂浮物過多并且表面覆蓋有保護膠，則為異常。通常，沒有漂浮的物體，或者幾乎沒有漂浮的有色顆粒。但是，如果有許多漂浮物體，則彩色顆粒會被保護膠的表面覆蓋，即使厚度一定，也表明這種類型的藝術涂料很差。

2. Look at the floating objects, high-quality art paintings, and there are no floating objects on the surface. If there are too many floating objects and the surface is covered with protective glue, it is abnormal. Usually, there are no floating objects, or almost no floating colored particles. However, if there are many floating objects, the colored particles will be covered by the surface of the protective glue. Even if the thickness is certain, it also indicates that this type of artistic coating is very poor.

3.看顆粒大小，用玻璃杯倒半杯水，然后將藝術涂料倒入玻璃杯中并攪拌。美術畫質好，杯子底部的水清晰，低質量的藝術畫時，杯子中的水會混濁，并且顆粒大小會有所區別。

3. Look at the particle size, pour half a glass of water into the glass, and then pour the art paint into the glass and stir. The quality of the art picture is good, and the water at the bottom of the cup is clear. When the art picture is of low quality, the water in the cup will be turbid, and the particle size will be different.

4.看銷售價格。正規制造商根據這些配方生產出高質量的藝術畫，價格適中，低質量的美術畫中，有些削減了產量，有些甚至偽造了個人作品，但價格低廉，質量好的油漆卻賣得很好。便宜得多，因此，在購買時，不要簡單地嘗試便宜而忽略產品的質量。

4. Look at the sales price. Regular manufacturers produce high-quality art paintings according to these formulas. The price is moderate. Among the low-quality art paintings, some have reduced the output, and some even forged personal works, but the low-cost and high-quality paints sell well. It's much cheaper, so when buying, don't simply try to be cheap and ignore the quality of the product.