Dublín, del 17 al 19 de novembre de 2017: visita a la fàbrica Guinness i retorn cap a casa (19 de novembre de 2017; dia 3) (VII)

Already one of the top-three British and Irish brewers, Guinness's sales soared from 350,000 barrels in 1868 to 779,000 barrels in 1876. In October 1886 Guinness became a public company, and was averaging sales of 1,138,000 barrels a year. This was despite the brewery's refusal to either advertise or offer its beer at a discount.  Even though Guinness owned no public houses, the company was valued at £6 million and shares were twenty times oversubscribed, with share prices rising to a 60 percent premium on the first day of trading.

The breweries pioneered several quality control efforts. The brewery hired the statistician William Sealy Gosset in 1899, who achieved lasting fame under the pseudonym "Student" for techniques developed for Guinness, particularly Student's t-distribution and the even more commonly known Student's t-test.

By 1900 the brewery was operating unparalleled welfare schemes for its 5,000 employees. By 1907 the welfare schemes were costing the brewery £40,000 a year, which was one-fifth of the total wages bill. The improvements were suggested and supervised by Sir John Lumsden. By 1914, Guinness was producing 2,652,000 barrels of beer a year, which was more than double that of its nearest competitor Bass, and was supplying more than 10 percent of the total UK beer market. In the 1930s, Guinness became the seventh largest company in the world.

Before 1939, if a Guinness brewer wished to marry a Catholic, his resignation was requested. According to Thomas Molloy, writing in the Irish Independent, "It had no qualms about selling drink to Catholics but it did everything it could to avoid employing them until the 1960s."

Guinness thought they brewed their last porter in 1973. In the 1970s, following declining sales, the decision was taken to make Guinness Extra Stout more "drinkable". The gravity was subsequently reduced, and the brand was relaunched in 1981. Pale malt was used for the first time, and isomerized hop extract began to be used, In 2014, two new porters were introduced: West Indies Porter and Dublin Porter.

Guinness acquired the Distillers Company in 1986. This led to a scandal and criminal trial concerning the artificial inflation of the Guinness share price during the takeover bid engineered by the chairman, Ernest Saunders. A subsequent £5.2 million success fee paid to an American lawyer and Guinness director, Tom Ward, was the subject of the case Guinness plc v Saunders, in which the House of Lords declared that the payment had been invalid.

In the 1980s, as the IRA's bombing campaign spread to London and the rest of Britain, Guinness considered scrapping the harp as its logo.

The company merged with Grand Metropolitan in 1997 to form Diageo PLC. Due to controversy over the merger, the company was maintained as a separate entity within Diageo and has retained the rights to the product and all associated trademarks of

The Guinness brewery in Park Royal, London closed in 2005. The production of all Guinness sold in the UK and Ireland was moved to St. James's Gate Brewery, Dublin.

Guinness has also been referred to as "the black stuff". Guinness had a fleet of ships, barges and yachts. The Irish Sunday Independent newspaper reported on 17 June 2007 that Diageo intended to close the historic St James's Gate plant in Dublin and move to a greenfield site on the outskirts of the city. This news caused some controversy when it was announced.

The following day, the Irish Daily Mail ran a follow-up story with a double page spread complete with images and a history of the plant since 1759. Initially, Diageo said that talk of a move was pure speculation but in the face of mounting speculation in the wake of the Sunday Independent article, the company confirmed that it is undertaking a "significant review of its operations". This review was largely due to the efforts of the company's ongoing drive to reduce the environmental impact of brewing at the St James's Gate plant.

On 23 November 2007, an article appeared in the Evening Herald, a Dublin newspaper, stating that the Dublin City Council, in the best interests of the city of Dublin, had put forward a motion to prevent planning permission ever being granted for development of the site, thus making it very difficult for Diageo to sell off the site for residential development.

On 9 May 2008, Diageo announced that the St James's Gate brewery will remain open and undergo renovations, but that breweries in Kilkenny and Dundalk will be closed by 2013 when a new larger brewery is opened near Dublin. The result will be a loss of roughly 250 jobs across the entire Diageo/Guinness workforce in Ireland  Two days later, the Sunday Independent again reported that Diageo chiefs had met with Tánaiste Mary Coughlan, the deputy leader of the Government of Ireland, about moving operations to Ireland from the UK to benefit from its lower corporation tax rates. Several UK firms have made the move in order to pay Ireland's 12.5 percent rate rather than the UK's 28 percent rate. Diageo released a statement to the London stock exchange denying the report. Despite the merger that created Diageo plc in 1997, Guinness has retained its right to the Guinness brand and associated trademarks and thus continues to trade under the traditional Guinness name despite trading under the corporation name Diageo for a brief period in 1997.

In November 2015 it was announced that Guinness are planning to make their beer suitable for consumption by vegetarians and vegans by the end of 2016 through the introduction of a new filtration process at their existing Guinness Brewery that avoids the need to use isinglass from fish bladders to filter out yeast particles. Update: On the company's FAQ webpage they say: "Our new filtration process has removed the use of isinglass as a means of filtration and vegans can now enjoy a pint of Guinness. All Guinness Draught in keg format is brewed without using isinglass. Full distribution of bottle and can formats will be in place by the end of 2017, so until then, our advice to vegans is to consume the product from the keg format only for now." 

Composition

Guinness stout is made from water, barley, roast malt extract, hops, and brewer's yeast. A portion of the barley is roasted to give Guinness its dark colour and characteristic taste. It is pasteurised and filtered. Despite its reputation as a "meal in a glass", Guinness only contains 198 kcal (838 kilojoules) per imperial pint (1460 kJ/l), slightly fewer than skimmed milk, orange juice, and most other non-light beers.

Until the late 1950s Guinness was still racked into wooden casks. In the late 1950s and early 1960s, Guinness ceased brewing cask-conditioned beers and developed a keg brewing system with aluminium kegs replacing the wooden casks; these were nicknamed "iron lungs". The production of Guinness, as with many beers, also involves the use of isinglassmade from fish. Isinglass is used as a fining agent for settling out suspended matter in the vat. The isinglass is retained in the floor of the vat but it is possible that minute quantities might be carried over into the beer.

Present day Guinness

Arguably its biggest change to date, in 1959 Guinness began using nitrogen, which changed the fundamental texture and flavour of the Guinness of the past as nitrogen bubbles are much smaller than CO₂, giving a "creamier" and "smoother" consistency over a sharper and traditional CO₂ taste. This step was taken after Michael Ash – a mathematician turned brewer – discovered the mechanism to make this possible. (Continuarà)