Why is pre-treatment important for insoluble particle detection using microscopic counting method

The core of microscopic counting method is "direct observation counting", while the essence of pre-processing is "creating ideal conditions for accurate counting" - by removing interference, ensuring uniformity, adapting detection capabilities, and ultimately achieving "counting results that can truly reflect the species, quantity, and particle size distribution of insoluble particles in the sample". If there are defects in the pre-processing stage (such as failure to remove bubbles, particle dispersion, or improper dilution), even the most accurate microscopic observation and counting operations in the subsequent process will result in incorrect results, leading to misjudgment of product quality (such as determining qualified products as unqualified or letting go of truly particle exceeding products). Therefore, pre-processing plays an important role in the entire testing process as a "veto power".