Choosing Colours

The Colour Wheel
White to cream..
Yellow to Beige..
Orange to Gold..
Light red to Maroon..
Pale pink to Crimson..
Lilac to Violet..
Light blue to Royal blue..
Sky blue to Marine blue..
Pale aqua to Turquoise..
Pale green to Darker greens.

Yarn Labels

Yarn Labels 

The Yarn label will include, the recommended hook size, the tension square, the shade/colour, the dye lot number, the weight or skein size - ie: 10g 25g 50g 100g 200g.
The fibre content, washing instructions, ironing instructions.
Also noted here is whether bleach can be used or Dry-cleanable only.

Yarn Weights

Yarn Weights 

Lace - 1.6 - 2.25 mm hooks.
Super Fine - 2.25 - 3.5 mm hooks.
Fine - 3.5 - 4.5 mm hooks.
Light - 4.5 - 5.5 mm hooks.
Medium - 5.5 - 6.5 mm hooks.
Bulky - 6.5 - 9 mm hooks.
Super Bulky - 9 mm and larger hooks.

Materials

Materials 

Yarns  - Cotton - Cotton crochet threads, Fine weight cotton yarns, Matt cotton, Mercerized cotton.
Wool - Merino wool, Wool.
Luxury - Silk, Cashmere.
Other Natural Fibres - Hemp, Ramie.
Synthetic Fibres - Nylon, Microfibre, Acrylic.
Yarn Blends - Natural and synthetic mixes, Wool and cotton mixes, Synthetic only mixes.
Multicoloured Yarns - Variegated wool yarn, variegated cotton yarn.
Novelty yarns and Textural Effects - Tape yarn, Metallics, Boucle yarn, Mohair, Novelty Fur yarn.
Unusual Yarns - Fabric, Wire, String, Plastic bags.