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'acid' affected rope part 2. unsatisfying! 6-Sep-2012 At 12:38:11 PM alrob

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I'm on my phone at the moment, so don't have access to the full article, but if you're going down the phosphoric acid path, this could be of help...

http://scripts.iucr.org/cgi-bin/paper?a06707
And
http://www.chemicalland21.com/industrialchem/inorganic/phosphorous%20acid.htm

Given H3PO4 is highly soluble in water, theory would be that over time the crystals would dissolve in the presence of moisture (rain, a humid day...), perhaps working into the rope further, then recrystalising when drying out in the cupboard. Repeat this a whole lot of times and the presence of crystals right through the rope is possible. The abrasive nature of those crystals may in fact weaken the rope, and may also be the reason why a once off soaking of the rope had little affect.

Dunno. Maybe I'm sorta right....