Roomba, Dysons, Thermomix and other household appliances

So about 4 days ago my 23 year old Fridge has started making a very loud humming noise methinks it is on its last legs. Hope all the usual suspects are having appliance sales on easter long weekend.
 
Does anyone own one of those ultrasonic jewellery cleaners and do they work or is it a scam?
 
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Not a great mixture for those who don't know about acids and, as a metallurgist, strongly suggest not one to be mixing at home. The result is Aqua Regia which dissolves gold, so you may have no jewellery left depending upon the strength. And, if you mix them the wrong way, you can produce chlorine gas. Nasty stuff and should only be used in a fume hood.
Try hydrochloric and nitric acid combined!
 
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Not a great mixture for those who don't know about acids and, as a metallurgist, strongly suggest not one to be mixing at home. The result is Aqua Regia which dissolves gold, so you may have no jewellery left depending upon the strength. And, if you mix them the wrong way, you can produce chlorine gas. Nasty stuff and should only be used in a fume hood.
Yes I know. Was a facetious remark given the nonsense combination already used instead of a nondestructive ultrasound device.
 
Yes I know. Was a facetious remark given the nonsense combination already used instead of a nondestructive ultrasound device.
The "nonsense combination" is actually a basic electrolytic reaction; for silver, the black tarnish (Ag2S) is converted back to silver and Al2S3 formed. Hot water increases reaction times and the salts increase pH and ion transfer. Ultrasound only cleans and doesn't remove sulphides/oxides.
 

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