A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . c acid, whilethe acid occur as sodium or potassium salts. Among the basic aniline dyes which are commonlyemployed may be mentioned fuchsin, gentian violet,methyl violet, crvstal violet, methylene blue, thionin,safranin, methyl green, neutral red, and vesuvin or Bis-marck brown. These are all more or less crystallinepowders, and while some are definite chemical com-pounds, others are mixtures. For this reason variousbrands aie met with on the market, and it wil
A Reference handbook of the medical sciences embracing the entire range of scientific and practical medicine and allied science . c acid, whilethe acid occur as sodium or potassium salts. Among the basic aniline dyes which are commonlyemployed may be mentioned fuchsin, gentian violet,methyl violet, crvstal violet, methylene blue, thionin,safranin, methyl green, neutral red, and vesuvin or Bis-marck brown. These are all more or less crystallinepowders, and while some are definite chemical com-pounds, others are mixtures. For this reason variousbrands aie met with on the market, and it will be readilyunderstood why the exact duplication of stains is not al-ways possible. It is advisable to keep on hand not only the solid dyes,but also stock .solutions which are saturated alcoholic 395 Bn<lirlol;;l<aITecliuiquc. REFERENCE HANDBOOK OF THE 5IEDICAL SCIENCES. solutions Tlie amount required to saturate will varyfrom two to tive jier ten I. The eoneentrated alcoholic solulious are never used assuch, but serve for the preparation of the dilute djeswliich are tlie stains projicr. The latter are made by. Flli. olas.^SIaTnl fell Stiiililll!; placing a few cubic centimetres of the concentrated dyein a small tincture bottle, and adding teii to twenty partsof water. This bottle istlien provided with a corii and apiece of glass tubing which serves as a pipette. Theditterent dilute dyes can be kept in a stand, sucli as isshown in Fig. 510*8. The dilute dyes after a while un-dergo alteration and yield deposits. In that event theysliotdd be filtered befoi-e use, or else new dilutions shouldbe made. Tlie acid aniline dyes are represented by eosin, acidfuchsin, and fluorescein. The concentrated and thedilute are prepared as above. The staining solutions may be used as such, or theirproperties may be accentuated by the addition of sub-stances which act more or less directly as mordants. Anumber of these solutions are in daily use, and for thatreason their p
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