Photographic Notes. 77 
powder-canister. Cut out the front and top. If the sides are 
bent back a little, it is better. A small hole can be cut in the 
back to pass a taper through to light the mixture. It is well to 
stand the lamp on an old tea-tray, as a very great heat is given 
out during combustion. Keep the sitters eyes from looking at the 
light, and wear a pair of blue glasses yourself. If the room is well 
lit with gas, the brightness of the flash is not felt so much.—H. 
H. WILLIAMS. 
Printing from a Broken Glass Negative.—Having had the 
misfortune to find a crack in one corner of a very good negative, 
to, cut off the crack would have spoiled the picture. I tried to 
print from the cracked glass, and got one good print; but in 
attempting to get another print, the crack ran across the plate and 
the print was good for nothing. I had a mixture of turpentine 
and Canada balsam, equal parts of each, used in re-touching 
negatives. I placed the negative in a frame, and then painted the 
crack on the glass side of the negative with the mixture ; saw that 
it soaked into the crack, filling it; then wiped off the surplus 
with benzine. The copy made after printing was good, and so 
were all subsequent ones. The crack had not gone through the 
film, but only through the glass. When preparing to print the 
third picture from the cracked negative, I noticed a row of small 
beads of the cement exuding from the crack. These I washed off 
with benzine, and after that I washed or cleaned the cracked part 
each time I used the negative.—C. SELLARS, in Anthony's Photo. 
Bulletin. 
Keeping Silver Paper—A noted chemist called to see me a 
few weeks ago, and having occasion to mention the method of 
keeping silvered paper as proposed by a firm in Massachusetts, I 
showed him one of the tin boxes containing the preservative 
compound. He took some of the material with him, and since 
has written me as follows :—‘“I found that the material which I 
took from the tin case at your house consisted simply of lime and 
charcoal. There was no chloride in it, so it could not be chloride 
of any sort. Burned limestone or caustic lime is a good and 
cheap absorbent of water from the air, and also of carbonic acid 
and acid vapours, if present. The charcoal is introduced, pro- 
bably, only as a disguise.” ‘These tin boxes, weighing, say, eleven 
ounces each (box and all), are sold at the rate of two dollars for 
six boxes. It may be well for those who want to save a little to 
try lime freshly burned—that is, unslacked. Perhaps it will 
answer the purpose.—/dcd. 
Halation in Negatives.—J. W. Lapham, in the British Journal 
Almanack, writes :—‘‘ The remedy I find most useful is to rub the 
portion of the negative affected by the halation with a piece of 
chamois leather wetted with methylated spirit. The best way is 
