In etching processing, hydrochloric acid is an important additive potion. But how much is appropriate, this must have a benign understanding. Both acidity and acidity have a great influence on product quality. The amount of hydrochloric acid can be measured by the pH value. The following is the anal

Hot stamping is already a very common part of printed matter, and the technology is also very mature. Here are five hot stamping methods for you. These five processing can be used in printing, and each has different characteristics. You can choose different hot stamping methods with different design