I am waiting on the delevery of the first half of my kodak RA-4 chemicals, and i decided to go to the computer shop and buy some compressed air, to use as a replacment for the tetenal butane spray. Would carbon dioxide be just as effective? It is only half the price! Especially when i mix my first 1L batch when i get the second half, to keep the air off parts B and C. (squirt, screw on cap quickly) Would this be as effective as the butane stuff? Much safer in my opinion!