Appendix. 509 



CAUSTIC OE WINTER WASHES. 

 CAUSTIC ALKALI WASH. 



FORMUUE. 



(1) Caustic Soda (70 p.c.) lib. 



Carbonate of Potash (80 p.c.) . . . . 1 Ib. 



Soft Soap i Ib. 



Water . .10 galls. 



(2) Soda Crystals (Soda Carbonate, 98 p.c.) . . 2^ Ibs. 

 Potassium Carbonate (80 p.c.) . . . . 1 Ib. 



Lime (fresh burnt) 2^ Ibs. 



Soft Soap (8 p.c. potash) . . . . .5 Ib. 

 Water 10 galls. 



The above are the old formula?. Spencer Pickering has shown that 

 caustic soda is alone necessary, the formula reading as below : 



Caustic Soda (98 p.c. purity) . . . . 2 to 2^ Ibs. 

 Water 10 galls. 



PREPARATION. 



(1) Dissolve the caustic soda and carbonate of potash in water and 

 then add the dissolved soft soap. 



(2) Slake the lime in a little water, and then add enough water to 

 make it into a milk of lime (about 1^ gallon of water). In this dissolve 

 the soda and potash, and then dissolve the soft soap in the rest of the 

 water and pour into the lime water. 



A considerable excess of lime is advised to ensure the soda and 

 potash being converted into the caustic state. This is Strawson's 

 formula. 



USES. 



For cleaning old, mossy, and rough barked trees in winter, and to some 

 extent killing mussel scale ova and soft scales. 



WOBURN WINTER WASH (A). 



FORMULA. 



Iron Sulphate J Ib. 



Lime . . . . , . .Jib. 



Caustic Soda ...... 2 Ibs. 



Paraffin (Solar distillate) .... 5 pints. 



Water 10 galls. 



