Saito Kimiko invented this toy fireworks "Hikari Nadeshiko." It is almost 30 cm large (1 foot) at peak. She burned Japanese red pine tree (with wax). The pine tree should be 60 years old, she said. She collected the ash. Then, she collected up 0.08g of ash, wrapped with chemical by kusaki-zome washi paper. You have to wait at least 2 years to get this Senko Hanabi.