8.12.24

Heather or Calluna vulgaris
(CHAPTER VII. Flavonol Group.)

The Natural Organic Colouring Matters By Arthur George Perkin, F.R.S., F.R.S.E., F.I.C., professor of colour chemistry and dyeing in the U...

Onion Skins
(CHAPTER VII. Flavonol Group.)

The Natural Organic Colouring Matters By Arthur George Perkin, F.R.S., F.R.S.E., F.I.C., professor of colour chemistry and dyeing in the U...

2.12.24

Sophora japonica
(CHAPTER VII. Flavonol Group.)

The Natural Organic Colouring Matters By Arthur George Perkin, F.R.S., F.R.S.E., F.I.C., professor of colour chemistry and dyeing in the U...