Some coloured pencils are water soluble - water can be brushed over them to blend colours. Water-soluble pencils are usually softer than ordinary coloured pencils and will go blunt more quickly.

Some coloured pencils are water soluble - water can be brushed over them to blend colours. Water-soluble pencils are usually softer than ordinary coloured pencils and will go blunt more quickly.

A batch of graphite has just been delivered to this pencil factory in Germany. Once it’s been thoroughly mixed with clay, it’s ready to go into production, with around 550 pounds of the stuff ...