preface to fifteenth edition

1 part 0.1% neutral red in alc. *
Violet-blue Green Violet blue at pH 7.0†
1 part 0.1% methylene blue in alc. 7.0
1 part 0.1% neutral red in alc.
Rose Green Dirty green at pH 7.4, pale rose at 7.2, clear rose at 7.0
1 part 0.1% bromthymol blue in alc. 7.2
2 parts 0.1% cyanine in 50% alc.
Yellow Violet Orange at pH 7.2, beautiful violet at 7.4, color fades on standing
1 part 0.1% phenol red in 50% alc. 7.3
1 part 0.1% bromthymol blue sodium salt in aq.
Yellow Violet Dirty green at pH 7.2, pale violet at 7.4, strong violet at 7.6†
1 part 0.1% phenol red sodium salt in aq. 7.5
1 part 0.1% cresol red sodium salt in aq.
Yellow Violet Rose at pH 8.2, distinctly violet at 8.4†
3 parts 0.1% thymol blue sodium salt in aq. 8.3
2 parts 0.1% -naphtholphthalein in alc.
Pale rose Violet Pale violet at pH 8.2, strong violet at 8.4
1 part 0.1% cresol red in alc. 8.3
1 part 0.1% -naphtholphthalein in alc.
Pale rose Violet Pale green at pH 8.6, violet at 9.0
3 parts 0.1% phenolphthalein in alc. 8.9
1 part 0.1% phenolphthalein in alc. *
Green Violet Pale blue at pH 8.8, violet at 9.0
2 parts 0.1% methyl green in alc. 8.9
1 part 0.1% thymol blue in 50% alc.
Yellow Violet From yellow thru green to violet†
3 parts 0.1% phenolphthalein in 50% alc. 9.0
1 part 0.1% phenolphthalein in alc.
Colorless Violet Rose at pH 9.6, violet at 10; sharp color change
1 part 0.1% thymolphthalein in alc. 9.9
1 part 0.1% phenolphthalein in alc.
2 parts 0.2% Nile blue in alc. 10.0 Blue Red Violet at pH 10†
2 parts 0.1% thymolphthalein in alc.
1 part 0.1% alizarin yellow in alc. 10.2 Yellow Violet Sharp color change
2 parts 0.2% Nile blue in aq.
1 part 0.1% alizarin yellow in alc. 10.8
Green
Red-brown
* Keep in a dark bottle. † Excellent indicator.
8.119