i.
Azoic dyes are directly insoluble
ii.
Excellent light fastness
iii.
Heat resistance moderate
iv.
Good wash fastness
v.
cotton, nylon, polyester, etc are dyed
vi.
poor rubbing fastness
vii.
They contain water insoluble Azo group (-N=N-)
viii.
They are fund of solid and powder form.
ix.
Toxic and
hazardous
x.
Salt increases Substantivity.