John Harte Posted September 21, 2022 Report Share Posted September 21, 2022 1 hour ago, Jim Bress said: John, for your tests you describe zero, mild, and long term. What were the ammonia concentration and durations of the mild and long term treatments? Thanks, Jim I have been worried that someone would ask me this... As I have mentioned this happened a while ago. I still have all the samples in a box somewhere. Notes may also exist but I wouldn't know where to begin looking for those. What I do recall is a small glass petri dish that would have contained no more than 10ml of ammonia being placed in the bottom of a screw topped closed glass jar which I would guess would have been around 1.5 litre volume. Each of the two fumed samples were suspended in the jar using some sort of thread (cotton, linen, polyester??? Probably whatever I was using for bow rehairing at the time..) The mild fuming would probably have been around 1 to 2 hours and the long term upwards of 12 hours. It could have been a day or two. The ammonia was bought from a chemical supply company and is described in a list of chemicals that I have as “strong ammonia”. Having said this, this bottle of ammonia was periodically opened outside for short periods over the years for the purposes of fuming boxwood peg shafts so would likely not be as potent as it originally was. I see in amongst the microscope photos a sample recorded as NH3 + heat. I am guessing that this was an attempt to get rid of the residual smell of ammonia or maybe add a more complex colour aspect to the spruce. I have no idea of how much the heating may have impacted the ammonia reaction, both in the short and long term. Quote Link to comment Share on other sites More sharing options...
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