Preparation materials: glutinous rice, yellow flowers, red and blue grass, purple and blue grass and maple leaves. Wash all kinds of materials one by one, add water that can cover 500g meters in the pot, and cook the colored materials separately for 5- 10 minutes in turn. Filter the boiled juice and discard the flower residue. Let the juice cool for a while and feel a little hot, about 50 degrees. Add completely dried glutinous rice (wash rice one day in advance, and then add it after it is completely dried) to avoid affecting the color dissolution.