ANDREAS KURTZ 133 



"May ist, 1835. Chrome yellow. 

 No. I. Nitric acid 100 + Litharge 150+750 Water 



= loooA. 

 Bichrome 50 + Red Sulphate 50 + 900 



Water = icooB. 

 The whole of these two solutions together give 



No i. 

 No. 2. Nitric acid 100 + Litharge 150 + 750 Water 



= loooA. 



Bichrome 72 + Red Sulphate 75 + 850 

 -= loooB. 



14 Copper Green : 100 blue vitriol and 1 10 

 acid gives 100 verdigris, 100 verdigris and 

 100 arsenic produces light green, if to this 

 light green 100 verdigris is added the colour 

 is much deeper and finer, and if 100 of 

 verdigris is added to this it is still finer, but 

 if more verdigris is added it gets bad again. 



Kurtz's chrome yellow was such a splendid 

 success that the Princess Charlotte had her 

 carriage painted with that dazzling pigment, 

 and the result was that for a season or two 

 all the carriages of the day in the fashionable 

 world were similarly coloured. Andreas 

 Kurtz was highly gratified at this triumph. 



Leaving these records of work with colours 

 and paints, we notice a series of experiments 

 he made with madder. He says: "Take 

 two gram and pour 100 of boiling water on 



