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 - Galeria

564 Red Ochre
X1: 311 Hooker's Green
X2: 522 Phthalo Green
Transparency: N/A
Permanence: AA
Colour Index Name: PR101

682 Vermilion Hue
X1: 311 Hooker's Green
X2: 522 Phthalo Green
Transparency: SO
Permanence: A
Colour Index Name: PR9

682 Vermilion Hue/Grey
X1: 311 Hooker's Green
X2: 522 Phthalo Green
Transparency: SO
Permanence: A
Colour Index Name: PR9

095 Cadmium Red Hue
X1: 311 Hooker's Green
X2: 522 Phthalo Green
Transparency: SO
Permanence: A
Colour Index Name: PR112

095 Cadmium Red Hue / Grey
X1: 311 Hooker's Green
X2: 522 Phthalo Green
Transparency: SO
Permanence: A
Colour Index Name: PR112

203 Crimson
X1: 311 Hooker's Green
X2: 522 Phthalo Green
Transparency: T
Permanence: A
Colour Index Name: PR170

533 Process Magenta
X1: 311 Hooker's Green
X2: 522 Phthalo Green
Transparency: T
Permanence: A
Colour Index Name: PV19

488 Permanent Magenta
X1: 311 Hooker's Green
X2: 522 Phthalo Green
Transparency: T
Permanence: A
Colour Index Name: PR122, PV19

728 Winsor Violet
X1: 537 Process Yellow
X2: 346 Lemon Yellow
Transparency: T
Permanence: A
Colour Index Name: PV23, (RS)

660 Ultramarine Blue
X1: 115 Cadmium Yellow Deep Hue
X2: 564 Red Ochre
Transparency: T
Permanence: A
Colour Index Name: PY150, PY3

178 Cobalt Blue
X1: 115 Cadmium Yellow Deep Hue
X2: 564 Red Ochre
Transparency: SO
Permanence: AA
Colour Index Name: N/A

535 Process Cyan
X1: 115 Cadmium Yellow Deep Hue
X2: 564 Red Ochre
Transparency: ST
Permanence: A
Colour Index Name: PB15:3, PW6

541 Prussian Blue Hue
X1: 115 Cadmium Yellow Deep Hue
X2: 564 Red Ochre
Transparency: SO
Permanence: A
Colour Index Name: PB29, PB15:3, PBk11

522 Phthalo Green
X1: 728 Winsor Violet
X2: 533 Process Magenta
Transparency: T
Permanence: A
Colour Index Name: PG7

311 Hooker's Green
X1: 728 Winsor Violet
X2: 533 Process Magenta'Transparency: SO
Permanence: AA
Colour Index Name: PB15, PY83

599 Sap Green
X1: 728 Winsor Violet
X2: 533 Process Magenta
Transparency: SO
Permanence: A
Colour Index Name: PY14, PG7, PBk7, PW6

294 Green Gold
X1: 728 Winsor Violet
X2: 533 Process Magenta
Transparency: ST
Permanence: A
Colour Index Name: PY129

346 Lemon Yellow
X1: 728 Winsor Violet
X2: 533 Process Magenta
Transparency: ST
Permanence: A
Colour Index Name: PY3

346 Lemon Yellow/Grey
X1: 728 Winsor Violet
X2: 533 Process Magenta
Transparency: ST
Permanence: A
Colour Index Name: PY3

653 Transparent Yellow
X1: 728 Winsor Violet
X2: 533 Process Magenta
Transparency: T
Permanence: A
Colour Index Name: PY150, PY3

653 Transparent Yellow/Grey
X1: 728 Winsor Violet
X2: 533 Process Magenta
Transparency: T
Permanence: A
Colour Index Name: PY150, PY3

537 Process Yellow
X1: 728 Winsor Violet
X2: 533 Process Magenta
Transparency: ST
Permanence: A
Colour Index Name: PY74

537 Process Yellow /Grey
X1: 728 Winsor Violet
X2: 533 Process Magenta
Transparency: ST
Permanence: A
Colour Index Name: PY74

120 Cadmium Yellow Medium Hue
X1: 728 Winsor Violet
X2: 533 Process Magenta
Transparency: O
Permanence: A
Colour Index Name: PY73, PY83

120 Cadmium Yellow Medium Hue/Grey
X1: 728 Winsor Violet
X2: 533 Process Magenta
Transparency: O
Permanence: A
Colour Index Name: PY73, PY83

115 Cadmium Yellow Deep Hue
X1: 728 Winsor Violet
X2: 533 Process Magenta
Transparency: SO
Permanence: A
Colour Index Name: PY65

115 Cadmium Yellow Deep Hue/ Grey
X1: 728 Winsor Violet
X2: 533 Process Magenta
Transparency: SO
Permanence: A
Colour Index Name: PY65

744 Yellow Ochre
X1: 728 Winsor Violet
X2: 533 Process Magenta
Transparency: O
Permanence: AA
Colour Index Name: PY42, PW6, PBk11

074 Burnt Sienna
X1: 311 Hooker's Green
X2: 522 Phthalo Green
Transparency: T
Permanence: AA
Colour Index Name: PR101, PY42, PBk11

552 Raw Sienna
X1: 311 Hooker's Green
X2: 522 Phthalo Green
Transparency: T
Permanence: AA
Colour Index Name: PY42, PR101, PBk9

076 Burnt Umber
X1: 522 Phthalo Green
X2: 311 Hooker's Green
Transparency: SO
Permanence: AA
Colour Index Name: PBr7