| Catechol and pyrogallol may be substituted for hydroquinone, but are not as suitable. |
| It is the only pyrogallol tannin which does not deposit bloom, or ellagic acid, on the leather. |
| In the case of some of these oxidizers pyrogallol will luminesce in dilute concentrations but not in strong. |
| Esculin will not luminesce with peroxidase and H2O2, but pyrogallol or gallic acid will. |
| The pyrogallol method of Preisz also proved to be unreliable in his hands. |
| Because of the tanning effect of catechol on emulsion gelatine, it has many of the properties of pyrogallol, including high acutance and low fog. |
