It is finer that granulated sugar but not as fine as powdered sugar (icing sugar for the UK right?). Honestly .... Caster Sugar has the same consistency as our Baker's Sugar (or superfine sugar) but the main AND THE MOST IMPORTANT difference between the two is what constitutes the sugar. read more
Mixing granulated sugar with sugar syrup and molding them in lumps leads to the production of sugar cubes. Castor sugar is also known as caster sugar, superfine sugar, ultrafine sugar or bar sugar. It is a type of granulated sugar that has superfine granulated crystals, usually 0.35 mm. read more
Caster sugar, in fact, can be made from granulated sugar by grinding granulated sugar crystals into crystals the size of caster sugar crystals. Differences between granulated sugar and castor sugar Granulated and caster sugar are similar in many ways but also different in other ways. read more