134 



ANDREAS KURTZ 



it and stir well but let it settle, and take the 

 clear, put one or two drops of carbonate of 

 soda solution, and compare it in the test tube 

 as to the density in colour to the best 

 madder. This is the most certain and 

 easiest way. 



A solution of acetate of lead on madder 

 powder will also indicate the quality ; with 

 good madder the powder gets a deep red, 

 and the bad madder is brown." 



Then follows a tabulated form, showing 

 various reactions : 



