Başak Hamur Kabartma Tozu is a powdered raising agent sold in small individual sachets. The pack carries the multilingual name Baking Powder / Backpulver / Bakpoeder, and the manufacturer lists the sachet at 10 g. It is made for the everyday baker who wants a measured amount ready to tip straight into the flour, with a recipe idea printed on every sachet.
In Turkish home baking, baking powder is what makes soft cakes, marble cakes, cookies, poğaça, muffins and sweet or savoury pastries rise and stay light. Mix the powder thoroughly with the dry ingredients before adding liquids, and use the quantity given in your recipe or on the sachet, because too much can leave a bitter taste.
Keep unused sachets in a cool, dry cupboard and close the pack after opening, since moisture slowly weakens any raising agent. Ingredient information is printed on the packaging, so check it if you have dietary requirements.