Asked at the table

Yes, with the usual caveat about the very youngest. Our clay is non-toxic and soft enough that a child of four or five can shape it without help, which is most of why we stock it. Under three we would keep it for supervised sessions only, because any small modeled piece is a small piece. The blocks are the better answer for that age.

A thin shape, say a leaf or a flat pendant, is firm in three or four hours and fully dry overnight. A solid piece the size of a fist wants a full day, sometimes two, and the core stays soft after the surface feels hard. Leaving it somewhere with moving air rather than in a sealed box speeds it along.

Press the air out of the bag and seal it, or wrap the piece in cling film and drop it in a lidded box. The kits arrive with zip bags for exactly this. If a lump has gone firm but not hard, a few drops of water kneaded through will usually bring it back; once it is fully set, it is set.

Three, honestly. It will not hold fine or thin detail, because unsupported shapes sag while they set. A very thick piece can crack as the outside shrinks first. And it is not waterproof once dry unless you seal it, so it is a shelf object rather than a mug. None of these matter for the kind of play it is designed for.

After, almost always. Acrylic sits beautifully on a dry surface and you can see what you are doing. The exception is tinting: kneading a drop of paint into wet white clay gives you a custom shade all the way through, which is useful when you need a color we do not sell.

Smooth plastic, a silicone mat and baking parchment all release cleanly. Bare wood and paper will bond to it as it dries. A dinner plate works if you have nothing else, and a tray with a lip keeps the session contained, which is the real reason we mention it.

They are built to the oversized standard used by the major brands, so they clutch onto existing large bricks and baseplates. Reviewers buy them specifically to extend a collection rather than replace it. The colors are molded, not printed, so they survive washing.

A multi-color kit, if the child is new to sculpting. The variety does a lot of the motivating, the tools remove the frustration of trying to cut a shape with a fingernail, and the tutorial booklet gives a first project to copy. Single colors make more sense once there is a habit.

From the live listing, re-checked on a schedule rather than typed once and forgotten. If a figure here and the figure on the listing ever disagree, the listing is the one that charges you, and we would like to hear about it so we can fix the page.

About 1.1 lb of a single shade, sealed so it stays soft until you open it. In practice that is a generous amount for a child-sized project: a pound of brown is more tree trunk than most builds will ever need, and it keeps well once opened.

Yes, and they mix cleanly because the material is soft all the way through. Two shades kneaded together give a true blend rather than a marbled mess, though the result is permanent, so mix small amounts until you have the shade you want.

No. The color runs through the clay and stays put as it dries, which is the appeal of buying by the shade. Paint is for the white tub, or for adding detail on top of a colored piece once it is firm.

A thin or flat shape is firm overnight. Something solid and fist-sized wants a day or two, and dries more evenly if you hollow out the thick part first.

Yes. Both the 36-color and the 150-color kits arrive with a set of small sculpting tools, and the card for each one lists what is in the box. The white tub is clay only, because it is bought for volume rather than as a starter set.

The 150-color kit is the one built for that: enough distinct shades that a table of children are not fighting over the same one, and enough total material for a session that actually finishes something.

Painting, mostly. White is the usual base when the plan is to paint afterwards, and 3.3 lb is the right amount for a diorama or a set of pieces that all want to match.

None of it. Everything on this shelf is air dry clay, which firms in open air. An oven will not help, and a hot oven will ruin it.

Both sets are made to the common big-brick standard and join onto the sets most households already have. That is the main reason we keep these two rather than a wider range of sizes.

Roughly two and up. The pieces are large enough to grip in one hand and too large to swallow, which is the whole argument for this size over the small bricks.

The 138 piece set if this is the first in the house, the 258 piece set if there are two builders or an existing pile that keeps running short of long pieces.

The card for each set lists exactly what arrives, including any plates and the instruction booklet. We keep that list in step with the listing rather than with the photograph on the box.