LOGWOOD STAINING. 



26l 



when cold add 60 grains of alum and one drachm of 

 alcohol, rub well together, filter through paper, and preserve 

 in a stoppered bottle. 



FIG. 222. 



STAINING PROCESS. Make a filtering cone by twice 

 folding a piece of filtering paper about i J inch diameter ; 

 support this in the neck of a small beaker or tube, and 

 filter through it about ten drops of the above liquid, add 

 thirty drops of distilled water, place the sections in the 

 mixture for five minutes (more or less), pour off the stain, 

 wash once or twice in distilled water, then soak for half an 

 hour in a solution of alum (20 grains to the ounce), remove 

 this, wash well with distilled water, and preserve in alcohol 

 so as to be ready for mounting. 



The logwood solution prepared in this way gives more 

 satisfactory results than when made as usually recom- 



