Potonglah beberapa kol merah. Tambahkan air mendidih ke kol Anda. Nyalakan blender. Tuangkan campuran melalui saringan. Tambahkan alkohol isopropil ke larutan indikator Anda. Tuangkan larutan ke panci atau mangkuk. Rendamlah kertas Anda dalam larutan indikator. Biarkan kertas Anda mengering di atas handuk. Potonglah kertas menjadi lembaran-lembaran. Gunakan lembaran kertas untuk menguji pH larutan yang berbeda. Simpanlah lembaran kertas di tempat yang sejuk dan kering.

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
You'll need to chop about ¼ of a head of red cabbage and put it in a blender. You will extract chemicals from the cabbage to coat your pH paper. These chemicals are known as anthocyanins and are found in plants such as cabbage, roses, and berries. Anthocyanins are purple under neutral conditions (pH 7.0) but they change color when exposed to an acid (pH < 7.0) or a base (pH>7.0).  The same procedure can be followed using berries, roses, and other anthocyanin containing plants. This does not work