106 THE BOOK OF THE LANTERN. 



is to use a proper developer and a bath which is in the 

 right condition. This bath should be an old one ; that is 

 to say, not a newly mixed one, one, in fact, which would 

 give very hard results for ordinary portraiture. 



It should have a small quantity of nitrate of baryta 

 mixed in it, say 3 grains to the ounce of bath. 



Develop with sulphate of iron sat. sol. ... 4 oz. 

 Methylated spirit 4 oz. 



Add these to a Winchester quart of distilled or rain 

 water ; and allow it to stand in the light for some hours, 

 next filter it into a clean bottle, and add 4 drops of 

 colocine. 



Just before using this developer add to it one drop of 

 acetic acid per ounce. This addition ensures a very fine 

 deposit, without it the deposit may be granular. The 

 exposure should be so regulated that no subsequent intensi- 

 fication is required, but if an error of judgment should be 

 made the image can be strengthened by adding a drop of 

 the silver bath to a little of the developer and flowing 

 it over the plate. The glass used should be the 

 best, and quite free from flaws of any kind. " Flatted 

 Crown " answers this description. It should be care- 

 fully cleaned and albumenised. The albumen should 

 be flowed over one side of the glass only, and it should 

 consist of the white of one egg to a pint of water, with 

 the addition of one drop of carbolic acid. 



A quantity of broken glass should be placed in this 

 bottle and the whole shaken up into froth, left to settle and 

 then filtered through cotton wool. As the plates are coated 

 with this albumen mixture, they should be reared up to 



