The color of kidney stones after crushed stones are various, the majority of kidney stones are brownish yellow, but some stones are black particles, and some of them are white particles, so there is no fixed color, and the color of the stones is different according to their composition. Calcium oxalate stones are mostly brownish yellow or dark brown, phosphate stones are mostly brownish yellow like crushed cookie crumbs, uric acid stones are mostly white particles, and some calcium oxalate dihydrate stones can be brown or black particles, etc. Sometimes the discharged stones are fine, but some of them are black particles. Sometimes the discharged stones are fine sand-like structures, which are not easy to distinguish with the naked eye, so it is necessary to collect urine for filtration to see the presence of precipitates. The color of stones discharged after lithotripsy need to use a colorless container, catch the urine and then filtered to distinguish, sometimes only gravel-like structure, can be touched by hand, but it is difficult to observe with the naked eye, because they may only have a volume of about 1-2mm.