Dec. 25. 1852.] 



NOTES AND QUEKIES. 



613 



exact meaning of the following quotation : — "With 

 the addition of as much free iodine as will give it a 

 sherry colour." 



Has Mr. C. exposed any of the waxed paper in 

 a wet state ? If he has, does it act quicker than if 

 exposed in a dry state ? Has Mr. C. ever tried 

 the addition of a little fluoride of potassium, in the 

 iodide bath ? The only thing wanted to render the 

 waxed-paper process more useful is, a more sensi- 

 tive preparation — to render it as sensitive as Le 



Gray has done, who states in his last pamphlet that 

 he has obtained proofs in two seconds in fine weather 

 in the shade, and in foggy weather in about thirty 

 seconds. The subjoined tables will show at a 

 glance the various formulae for preparing paper. 

 Skilful operatives should publish the various mo- 

 difications they use to suit the state of the light 

 and the kind of subjects they have to produce, in- 

 stead of giving us fixed rules, which only tend to 

 mislead those just commencing the art. R. E 



Iodizing FonMUUE. 



Sensitive roBMULa;. 



Mr. Crookes' Wax-paper Process. — Had I. W. 



taken the trouble to test by experiment the 

 information I communicated, and which in other 

 quarters was received with thankfulness, I should 

 not have occasion to repeat that, as regards Query 

 No. 1., if he follows my directions, and brings the 

 iodizing solution to a sherry colour, it may be 

 brown or pale to I. W.'s taste. If rose-coloured 

 had been mentioned, would I. W. have asked 

 whether yellow, purple, or white were meant ? 



Had I not been quite sure of the effect of the 

 iodine, I should not have asserted it. 



Query No. 2. — If the excited paper be washed for 

 a few minutes (any number between two and ten, 

 at the discretion of I. AV.), and this operation be 

 repeated three times, each time in separate water, 

 it will keep for three weeks. 



Query No. 3. — I consider that in naming a 

 nearly saturated solution of gallic acid, I have 

 been sufficiently explicit, considering that any 



