Tashiro (indicator)

safety instructions
GHS labeling of hazardous substances Caution
H and P phrases	H: 226
	P: 210-280-303 + 361 + 353-305 + 351 + 338

Tashiro is a mixed indicator ( pH value : 4.4 to 6.2) made of methylene blue and methyl red . Ethanol is used as the solvent .

Color indication

in acid: violet
Changeover point (pH = 5.2): gray
in the basic: green

Although in theory the transition point should be recognizable as colorless / gray, as with all indicators it is difficult in practice to titrate to the exact value of the transition point .

Individual evidence

↑ ^a ^b Tashiro indicator solution data sheet (PDF) from Carl Roth , accessed on March 23, 2020.

^ Arnold Willmes, Pocket Book Chemical Substances , Harri Deutsch, Frankfurt (M.), 2007.

[Carl_Roth-1] Tashiro indicator solution data sheet (PDF) from Carl Roth , accessed on March 23, 2020.

[TCS-2] Arnold Willmes, Pocket Book Chemical Substances , Harri Deutsch, Frankfurt (M.), 2007.