chuck wrote:I seriously doubt that the crayola smoke bomb can't be scaled down enough to work in a toy train.
I think you meant, "I seriously doubt that the crayola smoke bomb can be scaled down enough to work in a toy train."
Yes, they can be scaled down to fit into a Lionel smoke unit. No way I would recommend anyone do such a thing. Smoke bombs use potassium nitrate to supply oxygen to the process, Sugar to supply fuel, baking soda to control the temperature of the burn and dye to color the normally white smoke that results from burning. I notice everyone who lights one off runs away from it as soon as the fuse ignites.
Reference:
https://youtu.be/kWOqN_BQS7wchuck wrote:Plus you would have to worry about cleaning up the mess afterwards.
I look at the concept of black smoke as an advantage, you should be able to see what needs cleaning. With conventional smoke, the oily film left on everything (including air circulation ducts) is transparent and often not noticed.
chuck wrote:I suspect anything with particulate matter small enough to make an accurate 1/48 scale black smoke cloud would wind up being either toxic or at best hazardous to ones health.
No need to scale down particle size, the oil droplets in conventional smoke fluid condensate are totally satisfactory.
chuck wrote:The "smoke" from smoke fluid looks "white" because the particle size is so small that it refracts the light much the way water vapor in a cloud does. It scatter the wavelength evenly and you get "white". Most of the effluent from a real steam locomotive is also white for the same reason, it's mostly water vapor refracting light in the same way. You only get gray or black smoke when the combustion process is incomplete. The poorer the combustion, the more particulate mater and the darker the smoke.
The color from smoke bombs is not from incomplete combustion, it is from pigment or dye. I am sure black dye would yield the same results (black smoke) as red or blue dye in a smoke bomb.
Toy train smoke units operate in a different manner, they do not burn a powder, they boil an oil. What I do not know is would the oil and dye carrier boil off together. If so, would the oil and dye carrier boil off leaving the black pigment behind?
If the pigment will not exit a smoke box with the oil and pigment carrier (I suspect that would be the case) then a different method of operation would be required, like an oil pump to pump the smoke fluid through an atomizer nozzle. Aha! I feel an experiment coming on.