It depends on the enclosed volume, not on the size of the furniture. As a guide: 1 sachet for a watch box or a small case, 2-3 for a drawer or a shoe box, 4-5 for a suitcase or a large tool box, and 1 per kitchen jar. In an open space such as a whole wardrobe they won't do the job: there you need a hanging bag.

By the color, without opening anything. The beads start out orange and turn dark green when they can't absorb any more. If they're already green after a few days, the space isn't properly sealed or there's more moisture than a single sachet can handle: add more.

In the oven, at 100-120 °C for 1 to 2 hours, until the beads turn orange again. Let them cool outside the oven before using them: it's as they cool that they start absorbing again. Don't use the microwave, it can damage the paper.

Yes. The paper is food-grade and tested to European standards, so you can put them in jars of spices, pulses, rice, flour, coffee beans or nuts. What you must never do is open the sachet or mix the beads with the food: that's why it's printed with DO NOT EAT. Keep them out of reach of children and pets.

It depends on how humid the place is and how well sealed the space is. In a well-closed box or case it can last months; in a jar you open every day, weeks. You don't need to keep count: the color indicator tells you.

No, and we'd rather tell you before you buy. A 1 g sachet is made for small, enclosed volumes. For a whole wardrobe, a storage room or a bedroom, what works is a hanging bag or a larger-capacity format.

It's the same silica gel with a color indicator, in a different format. The 1 g sachets go inside boxes, cases and jars, one in each spot. The 900 g bag is loose beads, for refilling containers or drying larger volumes, such as 3D printer filament.