In a concentration of 1 per cent the ammonium salts of weak acids react positively with ninhydrin. by on March 14, 2009 www.jbc.orgDownloaded from. V. J. Harding and F. H. S. Warneford 335 3. In very high concentration the ammonium salts of the strong mineral acids give a positive ninhydrin reaction.
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The build cost for a simple extension can be Â£1000 â Â£1500 per mÂ². For glass extensions or high spec design Â£2000 â Â£2500 per mÂ² is more likely. For basements costs can be Â£3000 + per mÂ².