Question: What is the chemical formula of the kind of ash of which Middlewich Folk and Boat Festival celebrates the raw materials needed for the manufacturing?

Context paragraphs:
Expeller pressing: Expeller pressing (also called oil pressing) is a mechanical method for extracting oil from raw materials trademarked by Anderson International Corp.  Mr. Valerius D. Anderson founded the V. D. Anderson Company in Cleveland, Ohio in 1888.  In 1900, Mr. V. D. Anderson created the first successful continuously operated Expeller press.  The raw materials are squeezed under high pressure in a single step.  When used for the extraction of food oils, typical raw materials are nuts, seeds and algae, which are supplied to the press in a continuous feed.  As the raw material is pressed, friction causes it to heat up; in the case of harder nuts (which require higher pressures) the material can exceed temperatures of 120 F .

Newport Beach Wooden Boat Festival: The Newport Beach Wooden Boat Festival is an annual event held at the Balboa Yacht Club in Newport Beach, California.  The festival celebrates wooden boats of all sizes including wooden canoes, kayaks, and dinghies, as well as yachts and tall ships.

Shide railway station: Shide railway station, was an intermediate station at Shide on the southern fringes of Newport situated near Shide Chalk Pits on the line from Newport to Sandown incorporated by the Isle of Wight (Newport Junction) Railway in 1868, opened in 1875 and closed 81 years later.  A sparsely used station whose main purpose was to transport raw materials needed for the Island’s cement industry, it was doomed when production ceased during the Second World War.  The station was built over and the site is now occupied by

Middlewich Folk and Boat Festival: The Middlewich Folk and Boat Festival takes place in June in Middlewich, Cheshire, England.  The festival builds on the town's industrial heritage in which canal boats were used to move coal and other raw materials in the town for the production of salt, and then move the salt out of town, either for use directly, or as a raw material in the manufacture of chemicals such as chlorine and soda ash.

Foreign debt of the Socialist Republic of Romania: The foreign debt of the Socialist Republic of Romania were loans made by Socialist Republic of Romania under Nicolae Ceaușescu from international creditors denominated in hard currencies.  These loans were used to buy technology, equipment and raw materials needed for the industrialization of the country.

Lethbridge Dragon Boat Festival: Lethbridge Dragon Boat Festival is a dragon boat festival held annually in Lethbridge, Alberta, Canada.  The festival, held every July since 2002 at Henderson Park, attracts over 60 teams from British Columbia, Alberta, Saskatchewan, and Montana consisting of over 1600 participants.  The three-day festival is the largest dragon boat festival in Alberta, and it includes not only the dragon boat races but entertainment, vendors, and beer gardens.

The Middlewich Paddies: The Middlewich Paddies are an Irish folk band formed in 1979 in the town of Middlewich in Cheshire.  Although not widely known outside of folk music circles, two members of the band were instrumental in setting up the Middlewich folk and boat festival which has now become a recognised festival on the folk circuit.

ABCD line: The ABCD line (ABCDライン , Ēbīshīdī rain ) was a Japanese name for a series of embargoes against Japan by foreign nations, including America, Britain, China, and the Dutch.  It was also known as the ABCD encirclement (ABCD包囲陣 , Ēbīshīdī hōijin ) .  In 1940, in an effort to discourage Japanese militarism, these Western powers and others stopped selling iron ore, steel and oil to Japan, denying it the raw materials needed to continue its activities in China and French Indochina.  In Japan, the government and nationalists viewed these embargoes as acts of aggression; imported oil made up about 80% of domestic consumption, without which Japan's economy, let alone its military, would grind to a halt.  The Japanese media, influenced by military propagandists, began to refer to the embargoes as the "ABCD ("American-British-Chinese-Dutch") encirclement" or "ABCD line".

Sodium carbonate: Sodium carbonate (also known as washing soda, soda ash and soda crystals, and in the monohydrate form as crystal carbonate), NaCO, is the water-soluble sodium salt of carbonic acid.

Pamunuwa: Pamunuwa is a suburb of colombo city and near to Maharagama in Sri Lanka and is famous as a destination for clothing and textile.  It is located within Western Province.  From raw materials needed in textile industry to ready-made garments, Pamunuwa has been a center of attraction to people all over the country.

Supporting paragraphs: Middlewich Folk and Boat Festival Sodium carbonate
Answer: NaCO