Which of the following is not a preservative?

Dulcin

• Dulcin is a fake sugar multiple times better than sugar, found in 1883 by the Clean scientific expert Joseph Berliner Blau (27 August 1859 - 1935). It is a sweetener.
• Despite the fact that it was only discovered five years after saccharin, it never enjoyed the same level of commercial success.
• Despite this, it was a significant sweetener in the early 20th century. Unlike saccharin, it did not leave a bitter taste behind.

Potassium metabisulphite

• K2S2O5, also referred to as potassium pyrosulfite, is a white, crystalline powder with a strong odour.
• It is mostly used as a chemical sterilant or antioxidant.
• It is sometimes used interchangeably with sodium metabisulfite because of its chemical similarity to a disulfite.

Sodium benzoate

• Sodium benzoate is best known as a preservative used to extend the shelf life of processed foods and beverages.
• However, it also has a number of other uses. Benzoic acid and sodium hydroxide are combined to produce an odorless, crystalline powder.

Sorbic acid salts

• A natural organic compound known as 2,4-hexadienoic acid is utilized as a food preservative.
• It is a colourless solid that dissolves quickly and is slightly soluble in water.
• It got its name because it was first found in the unripe berries of the Sorbus aucuparia (rowan) tree.