Squeeze a few drops of food coloring over the clay, then knead to mix in the color. Continue to add food coloring until you reach your desired color. If you like, you can also add glitter to your clay to make it sparkly. Put the clay back into the pot and heat it over medium heat. Stir the clay as it warms to prevent it from sticking to the saucepan and burning. Remove the pot from the heat when your clay reaches the consistency you like. You can skip this step if you’re already happy with your clay. Don’t touch the clay while it’s hot, as you could get burned. Instead, spread the clay out on a baking sheet or the counter to let it cool down. When it feels just slightly warm, it’s ready for use. You can play with your clay or sculpt something out of it. If you do make a model or keepsake, you can preserve it by letting it dry. The clay will air dry if you let it sit out. Make sure you leave the clay untouched for at least 2 days so your sculpture doesn’t get messed up. Your clay will dry out in the air, so it’s important to put it away between uses. You can expect your clay to last for about 2 weeks if you consistently put it away in an airtight container. The best storage containers for this type of clay are plastic bags with a zipper or Tupperware.

TL;DR in Vietnamese:
Thêm vài giọt màu thực phẩm nếu bạn muốn đất sét có màu. Đun hỗn hợp đến khi bạn cảm thấy đặc, nếu cần. Chờ đất sét giảm xuống nhiệt độ phòng trước khi sử dụng. Hong khô đất sét khoảng 2 ngày nếu bạn muốn lưu giữ thành phẩm. Bảo quản đất sét bằng đồ đựng kín khi không sử dụng.