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<p>[QUOTE=&quot;Nigel2017, post: 3270403, member: 100065&quot;]<font size="3">Unfortunately this formula doesn&#039;t appear correct according to a tutorial on the ANCIENT COIN CLUB OF LOS ANGELES&#039; website. The two major issues being that a) you don&#039;t know which form of sodium carbonate you are dealing with as it has five forms of hydrate depending on how it has been produced/stored and b) even if you did know, the formula would produce an approximately 19% solution. </font></p><p><font size="3">Therefore it makes much more sense to buy powdered sodium sesquicarbonate (which is cheap) and then simply add a convenient quantity to 19 times its weight of distilled water. I picked 1kg of sodium sesquicarbonate for £5/US$6 on ebay.</font></p><p><font size="3">Apparently this is the formula the British Museum in London uses.</font>[/QUOTE]</p><p><br /></p>

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