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The specification of beta naphthol as below

Item	Excellent grade	Acceptable grade
Apperance	Gray and white flake,dark yellow is pemitted while  storing
No water first melting point ≥	120	119.5
Beta-naphthol content%  ≥	99.1	98.5
Alpha-naphthol content%≤	0.2	0.3
Water content %≤	0.1	0.1

beta-naphthol