1, by than ever great weight pours milk powder with hot water, sufficient agitate arrives not to see solid piece, put freezer next, wait for milk quiet place to drop in temperature.

2, preparative black cloth is mixed together empty cup. Filter serves as Hei Bumeng on empty cup mouth.

3, will cooling milk falls on black cloth to filter.

4, if white solid filter goes out, rinse a few times with clear water, remove other soluble substance.

5, if rinse crystal of late and existing white, can put crystal into clear water, if this crystal sinks benthic. That is probable be 3 get together cyanogen amine, this kind of milk powder cannot be used.

This kind of method cannot discover minim possibly 3 get together cyanogen amine, but of minim 3 get together the possibility that cyanogen amine makes the child gets stone is small also much, at least can guard a pass.