66 ON COLORING. 



already given. When greens are produced on blues dyed by 

 our first method, the blue part of the color will be most per- 

 manent. But the reverse happens when the saxon blue is used. 

 In dyeing silk green, it is thought best to apply the yellow first. 

 Employing a little logwood and sulphate of iron (copperas) with 

 the yellow and blue coloring matters, will change it to a bottle 

 green. 



ON COTTON. 



Cotton must be alumed, &;c., as directed in coloring yellow. 

 This may be done after it has received the blue by method first. 

 Macerating in a strong decoction of sumach, should not be omit- 

 ted in the process. There are many other compound colors, 

 which may be more cheaply produced by a direct application of 

 coloring matters by a single process. Of such we shall now 

 briefly treat. 



CINNAMON COLOR, &c. 



A very lasting cinnamon color may be dyed on wool, silk, or 

 cotton, with maple bark and alum. 



Hemlock bark, with alum, produces on wool a lasting bright 

 reddish brown, and on cotton a nankin color, which is less dura- 

 ble. With copperas, this bark produces drab and slate colors. 



Butternut bark dyes on wool, without any addition, a durable 

 tobacco brown. With alum it will be rendered brighter, and 

 may be fixed on cotton. With copperas, or iron dissolved in 

 vinegar, it communicates to wool, linen and cotton a strong and 

 lasting black ; with alum and copperas, various shades of brown 

 and drab. The bark of several species of walnut gives, with 

 alum, chesnut brown ; with copperas, drabs, he. 



Galls. These are excrescences produced upon several spe- 

 cies of oak by the gall-fly. Those in common use are imported, 

 but our farmers would do well to try those found on their own 

 oaks, peradventure they may therein discover another source of 

 income, for unless their use should be superseded by maple bark, 

 galls will always find a market. We have already spoken of 

 their use in dyeing black. It only remains to notice the light 



