It looks like an ordinary throw, except the design is printed as outlines that you colour in yourself. Most measure around 150 x 125 cm and come with a set of pens in the box.
The design is large, so it works best a little at a time rather than in one sitting. Several people can colour at once, so it suits couples, friends or a quiet evening round the table.
Themes range from flowers and fruit to cats and more fantastical scenes. A busy pattern keeps you going for weeks, while a simple one is done in a few evenings.
What makes the difference is the washable ink. According to the manufacturer, washable water-based ink comes out in a normal wash, leaving the printed outlines ready for another round. Always follow the care label on the blanket.
Some people switch to permanent pens for a finished blanket they want to keep as it is. You can mix both on the same project, as long as you remember which parts will stay.
A few practical tips help. Lay the blanket flat on a table rather than on your knees, and put the caps back on the pens between sessions. Start with lighter colours; darker ones are easier to add than to take away.
Many adults treat it as a relaxing hobby for evenings on the sofa. It is also a popular Christmas gift idea, as it is still useful once the colouring is done.
