Group C3: Gratnells Plastic colour Gratnells: C001, C011, C021 red. Plastic colour Gratnells: C015, C025 anthracite. Plastic colour Gratnells: C016, C026 translucent. Plastic colour Gratnells: C030, C040 dark red. Plastic colour Gratnells: C031, C041 dark blue. Plastic colour Gratnells: C032, C042 light blue. Plastic colour Gratnells: C033, C043 light green. Plastic colour Gratnells: C038, C048 turquoise ( ≈ RAL 210 40 20 ). Plastic colour Gratnells: C039, C049 broom yellow ( ≈ RAL1032 ).