The most important quality feature of lump sugar is its purity, as it is highly sensitive to contamination. Deficiencies caused by dirt or entailing a hazard to health result in serious claims (food safety legislation). ... Lump sugar is primarily used for sweetening hot drinks.
Lump sugar is refined sugar which has been pressed or cast into a particular shape. Chemically speaking, refined sugar is ultrapure sucrose which has been obtained from white sugar by dissolution and recrystallization. Its sucrose content is 99.9%. Refined sugar is pure white in color with sparkling crystals