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Lie·se·gang rings

n pl :  a series of usu. concentric bands of a precipitate that are separated by clear spaces and that are often formed in gels by periodic or rhythmic precipitation - called also Liesegang phenomenon 
 
Liesegang, Raphael Eduard (1869-1947),
German chemist. Liesegang was an outstanding colloid chemist. Investigating the chemical reactions occurring in gels, he discovered the periodic precipitation reactions in gels that are now known as Liesegang rings.
 
 

 
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