The photos of these color samples are meant to provide an overview of how each color behave in mixes.
The first two samples are base colour. The next 9 samples are the base color added increasing amounts of white indicated above each color.
The last 4 samples are equal amounts of base color and a contrasting color mixed in two variants . The two are mixed in two variations with white.
Winsor and Newton - Artisan

380 - Magenta
X1: 138 - Cerulean Blue Hue
X2: 503 - Permanent Sap Green
Transparency: T
Permanence: A
Colour Index Name: PR122

468 - Permanent Alizarin Crimson
X1: 138 - Cerulean Blue Hue
X2: 503 - Permanent Sap Green
Transparency: T
Permanence: A
Colour Index Name: PV19, PR206

90 - Cadmium Orange Hue
X1: 521 - Phthalo Green (Yellow Shade)
X2: 503 - Permanent Sap Green
Transparency: ST
Permanence: A
Colour Index Name: PO43

90 - Cadmium Orange Hue/Grey
X1: 521 - Phthalo Green (Yellow Shade)
X2: 503 - Permanent Sap Green
Transparency: ST
Permanence: A
Colour Index Name: PO43

100 - Cadmium Red Light
X1: 521 - Phthalo Green (Yellow Shade)
X2: 503 - Permanent Sap Green
Transparency: O
Permanence: A
Colour Index Name: PR108

100 - Cadmium Red Light/Grey
X1: 521 - Phthalo Green (Yellow Shade)
X2: 503 - Permanent Sap Green
Transparency: O
Permanence: A
Colour Index Name: PR108

99 - Cadmium Red Medium
X1: 521 - Phthalo Green (Yellow Shade)
X2: 503 - Permanent Sap Green
Transparency: O
Permanence: A
Colour Index Name: PR108

99 - Cadmium Red Medium/Grey
X1: 521 - Phthalo Green (Yellow Shade)
X2: 503 - Permanent Sap Green
Transparency: O
Permanence: A
Colour Index Name: PR108

98 - Cadmium Red Deep Hue
X1: 521 - Phthalo Green (Yellow Shade)
X2: 503 - Permanent Sap Green
Transparency: ST
Permanence: A
Colour Index Name: PR170, PO36

98 - Cadmium Red Deep Hue/Grey
X1: 521 - Phthalo Green (Yellow Shade)
X2: 503 - Permanent Sap Green
Transparency: ST
Permanence: A
Colour Index Name: PR170, PO36

104 - Cadmium Red Dark
X1: 521 - Phthalo Green (Yellow Shade)
X2: 503 - Permanent Sap Green
Transparency: O
Permanence: A
Colour Index Name: PR108

104 - Cadmium Red Dark/Grey
X1: 521 - Phthalo Green (Yellow Shade)
X2: 503 - Permanent Sap Green
Transparency: O
Permanence: A
Colour Index Name: PR108

109 - Cadmium Yellow Hue
X1: 229 - Dioxazine Purple
X2: 503 - Permanent Sap Green
Transparency: ST
Permanence: A
Colour Index Name: PY65

109 - Cadmium Yellow Hue/Grey
X1: 229 - Dioxazine Purple
X2: 503 - Permanent Sap Green
Transparency: ST
Permanence: A
Colour Index Name: PY65

116 - Cadmium Yellow Medium
X1: 229 - Dioxazine Purple
X2: 503 - Permanent Sap Green
Transparency: O
Permanence: A
Colour Index Name: PY35, PO20

116 - Cadmium Yellow Medium/Grey
X1: 229 - Dioxazine Purple
X2: 503 - Permanent Sap Green
Transparency: O
Permanence: A
Colour Index Name: PY35, PO20

113 - Cadmium Yellow Light
X1: 229 - Dioxazine Purple
X2: 503 - Permanent Sap Green
Transparency: O
Permanence: A
Colour Index Name: PY35

113 - Cadmium Yellow
Light/Grey
X1: 229 - Dioxazine Purple
X2: 503 - Permanent Sap Green
Transparency: O
Permanence: A
Colour Index Name: PY35

346 - Lemon Yellow
X1: 229 - Dioxazine Purple
X2: 503 - Permanent Sap Green
Transparency: ST
Permanence: A
Colour Index Name: PY3

346 - Lemon Yellow/Grey
X1: 229 - Dioxazine Purple
X2: 503 - Permanent Sap Green
Transparency: ST
Permanence: A
Colour Index Name: PY3

503 - Permanent Sap Green
X1: 502 - Permanent Rose
X2: 468 - Permanent Alizarin Crimson
Transparency: T
Permanence: A
Colour Index Name: PY110, PB15

521 - Phthalo Green (Yellow Shade)
X1: 99 - Cadmium Red Medium
X2: 90 - Cadmium Orange Hue
Transparency: T
Permanence: A
Colour Index Name: PG36

522 - Phthalo Green (Blue Shade)
X1: 99 - Cadmium Red Medium
X2: 90 - Cadmium Orange Hue
Transparency: T
Permanence: A
Colour Index Name: PG7

692 - Viridian
X1: 99 - Cadmium Red Medium
X2: 90 - Cadmium Orange Hue
Transparency: T
Permanence: AA
Colour Index Name: PG18

538 - Prussian Blue
X1: 99 - Cadmium Red Medium
X2: 90 - Cadmium Orange Hue
Transparency: T
Permanence: A
Colour Index Name: PB27

137 - Cerulean Blue
X1: 99 - Cadmium Red Medium
X2: 90 - Cadmium Orange Hue
Transparency: SO
Permanence: AA
Colour Index Name: PB35

138 - Cerulean Blue Hue
X1: 99 - Cadmium Red Medium
X2: 90 - Cadmium Orange Hue
Transparency: SO
Permanence: AA
Colour Index Name: PB36, PW4

178 - Cobalt Blue
X1: 99 - Cadmium Red Medium
X2: 90 - Cadmium Orange Hue
Transparency: ST
Permanence: AA
Colour Index Name: PB28

263 - French Ultramarine
X1: 99 - Cadmium Red Medium
X2: 90 - Cadmium Orange Hue
Transparency: T
Permanence: A
Colour Index Name: PB29

514 - Phthalo Blue (Red Shade)
X1: 99 - Cadmium Red Medium
X2: 90 - Cadmium Orange Hue
Transparency: T
Permanence: A
Colour Index Name: PB15

229 - Dioxazine Purple
X1: 113 - Cadmium Yellow Light
X2: 346 - Lemon Yellow
Transparency: T
Permanence: A
Colour Index Name: PV23

76 - Burnt Umber
X1: 229 - Dioxazine Purple
X2: 538 - Prussian Blue
Transparency: T
Permanence: AA
Colour Index Name: PBr7

552 - Raw Sienna
X1: 229 - Dioxazine Purple
X2: 538 - Prussian Blue
Transparency: T
Permanence: AA
Colour Index Name: PBr7, PY42

74 - Burnt Sienna
X1: 229 - Dioxazine Purple
X2: 538 - Prussian Blue
Transparency: T
Permanence: AA
Colour Index Name: PR101

331 - Ivory Black
Transparency: O
Permanence: AA
Colour Index Name: PBk9
644 - Titanium White
Transparency: O
Permanence: AA
Colour Index Name: PW6, PW4

554 - Raw Umber
X1: 229 - Dioxazine Purple
X2: 538 - Prussian Blue
Transparency: T
Permanence: AA
Colour Index Name: PBr7