Editing Old Firm (section)

===Joint sponsorship===
Glasgow-based brewers [[Wellpark Brewery|Tennent's]] were the primary commercial sponsor of both teams for several years;<ref>{{cite news|url=http://news.bbc.co.uk/sport1/hi/football/scot_prem/8495426.stm|title=Celtic & Rangers sign sponsorship deal with Tennent's|work=BBC Sport|date=3 February 2010|access-date=16 September 2017|archive-date=22 November 2021|archive-url=https://web.archive.org/web/20211122150404/http://news.bbc.co.uk/sport2/hi/football/scot_prem/8495426.stm|url-status=live}}</ref><ref>{{cite news|url=http://sport.stv.tv/football/clubs/celtic/209075-celtic-announce-shirt-sponsorship-deal-with-magners/|title=Celtic and Rangers confirm end of joint sponsorship deals after 14 years|work=STV Sport|date=9 January 2013|access-date=16 September 2017|archive-date=4 March 2016|archive-url=https://web.archive.org/web/20160304025516/http://sport.stv.tv/football/clubs/celtic/209075-celtic-announce-shirt-sponsorship-deal-with-magners/|url-status=live}}</ref> any local business that only sponsored one would likely lose half its customers.<ref name="borden20120809">{{cite news |url=https://www.nytimes.com/2012/08/09/sports/soccer/in-scottish-soccer-the-rangers-celtic-rivalry-is-rattled-to-its-core.html |title=Dissolving Scotland's Old Firm |work=[[The New York Times]] |date=9 August 2012 |access-date=19 October 2015 |last=Borden |first=Sam |pages=B18 |archive-date=24 October 2015 |archive-url=https://web.archive.org/web/20151024232732/http://www.nytimes.com/2012/08/09/sports/soccer/in-scottish-soccer-the-rangers-celtic-rivalry-is-rattled-to-its-core.html |url-status=live }}</ref> Previously, glazing company [[CR Smith (company)|CR Smith]] (who later had a deal with Celtic alone),<ref name=share>{{cite news| url=https://www.theguardian.com/football/1999/feb/25/newsstory.sport1| title=Old Firm pair to share sponsor| newspaper=[[The Guardian]]| date=25 February 1999| access-date=16 September 2017| archive-date=16 September 2017| archive-url=https://web.archive.org/web/20170916182556/https://www.theguardian.com/football/1999/feb/25/newsstory.sport1| url-status=live}}</ref><ref name=double>{{cite news| url=http://www.scotsman.com/sport/football/competitions/premiership/magners-shirt-cash-for-celtic-ends-old-firm-double-deals-1-2727282| title=Magners shirt cash for Celtic ends Old Firm double deals| newspaper=[[The Scotsman]]| date=9 January 2013| access-date=16 September 2017| archive-date=16 September 2017| archive-url=https://web.archive.org/web/20170916225447/http://www.scotsman.com/sport/football/competitions/premiership/magners-shirt-cash-for-celtic-ends-old-firm-double-deals-1-2727282| url-status=live}}</ref> communications firm [[NTL Incorporated|NTL]]<ref>{{ cite news | url=http://www.highbeam.com/doc/1P2-23732888.html| archive-url=https://web.archive.org/web/20150329175146/http://www.highbeam.com/doc/1P2-23732888.html| url-status=dead| archive-date=29 March 2015| title=Old Firm are united in £13m shirt deal| work=Times & Herald Group |first=Rob |last=Robertson| date=20 March 1999|access-date=16 September 2017}}</ref> and English brewers [[Carling brewery|Carling]]<ref>{{cite news| url=http://www.thegrocer.co.uk/fmcg/carling-to-sponsor-old-firm/82408.article| title=Carling to sponsor Old Firm| publisher=thegrocer.co.uk| date=3 January 2003| access-date=16 September 2017| archive-date=22 March 2019| archive-url=https://web.archive.org/web/20190322134454/https://www.thegrocer.co.uk/fmcg/carling-to-sponsor-old-firm/82408.article| url-status=live}}</ref> had also sponsored both clubs.