I was sent a few sample dots of Wichitrong Watercolours - an artist quality range from Thailand.
This is a modest range of 24 colours, many single pigments. The only listed ingredients I could find are pigment and gum Arabic, though they feel as though there may also be a honey-like ingredient as well.
The pigment information is difficult fo find, so I will list it here. The bold colours are those I have tried, shown below.
801 Titanium White: PW6 (Titanium Dioxide) Series1
803 Lemon Yellow: PY3 (Monoazo) Series 1
805 Azo Yellow: PY154 (Benzimidazolone) Series 1
808 Cadmium Yellow Medium: PY37 (Cadmium) Series 3
809 Gamboge: PY154 (Benzimidazolone) + PY42 (Iron Oxide) + PY83 (Diarylide) Series 2
811 Cadmium Orange: PO20 (Cadmium) Series 3
813 Permanent Red: PR254 (Diketo-Pyrrolo-Pyrrolo) Series 2
816 Crimson Lake: PR177 (Anthraquinone) Series 3
817 Rose Madder: PV19 (Quinacridone) Series 3
819 Deep Magenta: PR122 (Quinacridone) Series 3
820 Dioxazine Purple: PV23 (Dioxazine) + PV23 (Carbazole Dioxazine) Series 2
821 Mauve: PV24 (Dioxazine) = PR81 (Rhodiamine Red) Series 2
822 Ultramarine Blue: PB29: (Ultramarine Blue) + PB28 (CoAI2O4) Series 1
825 Phthalo Blue: PB15.3 (Cu Phthalo.Blue) Series 1
826 Cobalt Blue: PB28 (CoAI2O4) Series 3
827 Cerulean Blue: PG50 (Co2TiO4) + PB28 (Cobalt Aluminium Spinel) Series 3
829 Phthalo Green: PG7 (Cu Phthalo Green) Series 1
831 Sap Green: PY83 (Diarylide) + PY168 (Monoazo Yellow) + PG7 ( Cu Phthalo.Green) Series 2
832 Leaf Green: PY154 (Benzimidazolone) + PG7 (Cu Phthalo.Green) Series 2
834 Raw Sienna: PY42 (Synthetic Hydrated Iron Oxide) + PBr7 (Calcined Natural Iron Oxide) + PY1 (Monoazo) + PR101 (Iron Oxide) Series 1
837 Burnt Sienna: PBr7 (Calcined Natural Iron Oxide) Series 1
848 Burnt Umber: PR101 (Irone Oxide) + PY42 (Synthetic Hydrated Iron Oxide) + PB15.3 (Cu Phthalo.Blue) Series 1
840 Payne's Grey: PB15.3 (Cu Phthalo.Blue) + PBk7 (CArbone Black) + PV19 (Quinacridone) Series 1
Here are the samples I tried. They are finely ground pigments that painted out nice and richly. The Burnt Sienna has a very yellow undertone so will mix greens rather than greys with Ultramarine.