This quartet of colours is designed to be transparent, bright and non granulating - a bit like working with inks - and works beautifully!
It is based around a fabulous pair of transparent watercolours - Transparent Pyrrol Orange DS and Phthalo Blue RS DS. These neutralise each other completely to create a fantastic range of greys, black, warm browns and burnt oranges. See the first colour mixing row 1.
Other manufacturers make Phthalo blue RS (or Winsor Blue RS) but I have not found an alternative brand for this orange. Schmincke make Translucent Orange with the same pigment but it is not as red. (see separate post on oranges and blues) QoR also make a transparent pyrrol orange but it is not the same hue. As mentioned in the comments below, I'd recommend using Daniel Smith with or without Schmincke for this set, but I find W&N colours can fight with DS colours so I don't suggest mixing those brands.
|Hansa Yellow Medium PY97 Daniel Smith, Purple Magenta PR122 Schmincke (or use the new DS Quinacridone Lilac), Phthalo Blue R.S. PB15 Daniel Smith and Transparent Pyrrol Orange PO71 Daniel Smith.|
|Mixes with my amazing quartet along with Phthalo Green PR7.|