Among them, KOH processing reaction rate is the fastest, can achieve the best results within 10s, and the sample sclastated, the maximum height difference of the lint, the drop percentage of the lint Pt value is higher, but the reaction time needs to be strictly controlled, otherwise it is easy to etch excessive damage to the inverted pyramid structure. Ultrasound method is convenient to operate, the efficiency is also faster, but the surface decoration ability is weak, the maximum height difference of suede, the reduction percentage of the lint Pt value is not high. When copper iron reacts, the reaction rate is the slowest and the effect is average, the maximum height difference of the suede is, and the drop percentage of the lingo Pt value is the lowest
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