pH Indicators - Solids

They typically are organic compounds that change color in proportion to the concentration of hydrogen ions in the solution. Indicators do not change color precisely at one pH value. Instead, over a specific pH range the color of the indicator continuously changes. The range is different for each indicator. The transition point of an indicator is defined as the point at which the acid and alkaline forms of the indicator exist in equal concentrations.

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206709 Alizarin Yellow GG Dye content 50 %
201375 Brilliant Yellow Dye content ≥50 %
17470 Bromocresol Green Sultone Form for microscopy (Bot., Hist., Vit.), indicator (pH 3.8-5.4)
114375 Bromocresol Purple BioReagent, suitable for indicator, Dye content 90 %
17490 Bromocresol Purple for microscopy (Hist., Vit.), indicator (pH 5.2-6.8)
860891 Bromocresol Purple sodium salt indicator grade, Dye content 90 %
B0126 Bromophenol Blue
114391 Bromophenol Blue ACS reagent
114405 Bromophenol Blue sodium salt Dye content 90 %, ACS reagent
B8630 Bromothymol Blue sodium salt powder
18470 Bromothymol Blue sodium salt for microscopy (Bot., Hist., Vit.), indicator (pH 6.0-7.6)
114421 Bromothymol Blue sodium salt ACS reagent
205478 Bromoxylenol Blue indicator grade, Dye content 95 %
60910 Congo Red for microscopy (Bact., Bot., Hist.), indicator (pH 3.0-5.2), Reag. Ph. Eur.
C6767 Congo Red Dye content ≥35 %
C85778 o-Cresolphthalein indicator grade
857890 m-Cresol Purple indicator grade, Dye content 90 %
114472 Cresol red indicator grade, Dye content 95 %
D198609 2,5-Dinitrophenol 97%
199567 Ethyl Orange sodium salt indicator grade, Dye content 90 %
202029 Metanil Yellow Dye content 70 %
68250 Methyl Orange for microscopy (Hist.), indicator (pH 3.0-4.4)
114510 Methyl Orange ACS reagent, Dye content 85 %
250198 Methyl Red ACS reagent, crystalline
M8256 Methyl Red sodium salt Crystalline
114502 Methyl Red sodium salt ACS reagent, Dye content 95 %
195073 Mordant Orange 1 Dye content 70 %
N4638 Neutral Red powder, BioReagent, suitable for cell culture
N7005 Neutral Red Dye content ≥90 %
72210 Neutral Red for microscopy (Bact., Bot., Fl., Hist., Vit.), indicator (pH 6.8-8.0)
861251 Neutral Red certified by the Biological Stain Commission
P9750 Phenolphthalein pH indicator
33518 Phenolphthalein ACS reagent, reag. Ph. Eur., indicator, 98-102% (calc. to the dried substance), S. No.: 879
105945 Phenolphthalein ACS reagent
114529 Phenol Red ACS reagent
P4758 Phenol Red sodium salt
114537 Phenol Red sodium salt ACS reagent, Dye content 90 %
201316 Quinaldine Red Dye content 95 %
861324 p-Rosolic acid Dye content 85 %
114545 Thymol Blue ACS reagent
89360 Thymolphthalein ACS reagent, indicator (pH 8.8-10.5)
114553 Thymolphthalein ACS reagent, Dye content 95 %
75360 Tropaeolin 000 No. 1 for microscopy (Hist.), indicator (pH 7.6-8.9)
205486 Xylenol Blue indicator grade, Dye content 90 %