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Thymol blue is a brownish-green or reddish-brown crystalline powder that is used as a pH indicator.

Orcein are names for dyes extracted from several species of lichen, commonly known as orchella weeds found in various parts of

Nitrazine or is a pH indicator dye often used in medicine.

salalah Chemical industry Based in salalah Oman.

salalah Chemical industry Based in salalah Oman.

salalah Chemical industry Based in salalah Oman.

Bromothymol blue is a pH indicator.

Fuchsine or rosaniline hydrochloride is a magenta dye .