Editing Cannon (section)

==Restoration==
Cannon recovered from the sea are often extensively damaged from exposure to salt water; [[Extractive metallurgy|electrolytic reduction treatment]] is required to forestall corrosion.<ref>{{cite web|last=Welss|first=Carmen|title=Rescue Project 'Endeavour Cannon'|publisher=[[Foundation for National Parks & Wildlife]]|url=http://fnpw.com.au/enews4/cannon.htm|access-date=26 May 2008|url-status=dead|archive-url=https://web.archive.org/web/20080720144457/http://www.fnpw.com.au/enews4/cannon.htm|archive-date=20 July 2008}}</ref> The cannon is then washed in [[Purified water#Deionization|deionized]] water to remove the [[electrolyte]], and is treated in [[tannic acid]], which prevents further [[rust]] and gives the metal a bluish-black colour.<ref>{{cite web|publisher=Canadian Conservation Institute|url=http://www.preservation.gc.ca/gallery/cannon_e.asp|title=Preserving My Heritage – Before & After Gallery – Cannon|access-date=26 May 2008| archive-url = https://web.archive.org/web/20050329181011/http://www.preservation.gc.ca/gallery/cannon_e.asp| archive-date = 29 March 2005}}</ref><ref name="union"/> Cannon on display may be protected from oxygen and moisture by a [[wax]] sealant. A coat of [[polyurethane]] may also be painted over the wax sealant, to prevent the cannon from attracting dust.<ref name="union">{{cite web|url=http://nautarch.tamu.edu/crl/Report6/union.htm|archive-url=https://web.archive.org/web/20050101190851/http://nautarch.tamu.edu/crl/Report6/union.htm|archive-date=1 January 2005|title=Civil War Union Cannon Conservation, CRL Report 5|access-date=26 May 2008}}</ref>