Article in English: Cold process soap is made from oils, lye, and water. When these ingredients are combined at the right temperature, they harden into soap in a process called saponification. Go to your local craft store and grocery store to purchase the ingredients listed. It's easiest to clear a space in the kitchen since you'll need to heat the ingredients over the stove. You'll be working with lye, a dangerous chemical, so make sure children and pets are not underfoot while you work. Spread newspaper over a table and assemble the following equipment, which can be sourced online or from your local craft store:  Safety goggles and rubber gloves, to protect you from the lye. A scale to weigh the ingredients. A large stainless steel or enamel kettle. Do not use aluminum, and do not use a pot lined with a non-stick surface. A glass or plastic wide-mouth pitcher, to hold the water and lye. A two-cup plastic or glass measuring cup. Plastic or wooden spoons. A stick blender, also called an immersion blender. This isn't absolutely necessary, but it reduces stirring time by about an hour. Two glass thermometers that register between 80-100 degrees F. Candy thermometers work well for this purpose. Plastic molds that are suitable for cold process soapmaking, or shoebox, or a wooden mold. If you use a shoebox or wooden mold, line it with parchment paper. Multiple towels for cleanup. Before you start the soap-making process, read the safety warnings that came on your box of lye. Keep the following in mind as you handle lye or raw soap before it has been cured:  Lye should never touch your skin, as it will burn you. Wear safety goggles and glove at all times while handling lye and raw soap. Work with lye outside or in a well-ventilated area to avoid breathing in fumes.

Summary in Vietnamese:
Chuẩn bị nguyên liệu. Chuẩn bị khu vực làm xà phòng. Đọc cách sử dụng dung dịch kiềm một cách an toàn.