Molasses are the main raw material used for the production of ThaiBev's spirits, so that most of the products fall under the category of rum. As is the case with all distilled spirits, the distillate is crystal clear when first distilled. Amber and dark brown spirits obtain their colour from the extracts from the oak barrel during aging and from caramel, a natural coloring agent.
ThaiBev's yeast cultures, used for fermentation, are grown in its own laboratory and propagated in a yeast propagation tank. The yeast, molasses diluted by water, steamed rice that has been sprayed with mould (to create sugar) and incubated for four days, and water are added into a fermenter and the mixture is allowed to ferment for approximately 72 hours. The liquid that is left at the end of the fermentation process is known as fermented mash.
Distillation takes place in a distilling column and a pot still, which is a large copper or stainless steel kettle. Distilling involves boiling the "fermented mash" and condensing its vapour. The spent sludge remaining in the pot still is removed to be processed. The company's white spirits are then diluted with demineralized water to the desired alcohol content in a white spirits blending tank and sent to be packaged and bottled after filtering.
Brown spirits are diluted with demineralized water and then aged in oak barrels for three to eight years depending on the brand. The aged alcohol is then further diluted with demineralized water before bottling. Liquor concentrate alcohol and caramel colour are added. The brown spirits are passed through filters and then bottled and packaged. ThaiBev also makes Chinese herb spirits, branded as Chiang-Chun and Sua Dum. These are produced by blending alcohol, white spirits, sugar, caramel and Chinese herbs, and then further diluting the mixture with demineralized water.