The Home Scientist 009 - Forensic Fingerprinting III: Superglue
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Dear Mr. Robert! Thanks a lot for this great help. Your videos have helped amzingly we, csi´s of Brazil.
I would like to ask you if you have some book about the theme. Or planning to publicize some book?
I wait for reply.
Thank you!
Pablo
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Can you explain more about the role of NaOH, is it just generating heat by RXN that is causing the cyanoacrylate to vaporize?
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How long would it take without the sodium hydroxide?
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@carlos10047275 sodum hydroxide is costic soda you can get it from store
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how do you make soot to reveal fingerprints on light objects?
sweetsensation115 1 year ago
@sweetsensation115
Fill a beaker, test tube, or similar glass vessel with cold water. Light a candle, and use it to "smoke" the glass, depositing lampblack on the glass surface. You can also use soot from a fireplace or similar source.
TheHomeScientist 1 year ago
i am not a chemistry expert, could you please tell me how to prepare the accelerating NaOH solution?
carlos10047275 1 year ago
@carlos10047275
The concentration is not at all critical. Simply dissolve a small amount of sodium hydroxide in a small amount of water and use it to saturate the cotton. Be very careful with sodium hydroxide. Dissolving it generates a lot of heat, and both the solid and the solution are corrosive and extremely dangerous to your eyes.
TheHomeScientist 1 year ago
what about a higher concentration of sodium hydroxide, perhaps 10%? Should it speed up the reaction?
carlos10047275 1 year ago
@carlos10047275
Maybe, but probably not. I haven't really looked into the details, but I believe the reaction is base-catalyzed, so any reasonable amount of hydroxide should have about the same effect.
TheHomeScientist 1 year ago