Activated Charcoal can be used to obtain a light grey to a pure black colour in natural soap. It's often used as a general detoxifier.

Bergamot Essential Oil is a light greenish-yellow liquid with a fresh sweet-fruity, slightly spicy balsamic undertone.
Blending Suggestions: Lavender, Lavandin, Jasmine, Geranium, Lemon, Chamomile, Juniper, Coriander, Violet.

Cajeput Essential Oil is a pale yellowy-green mobile liquid with a penetrating, camphoraceous-medicinal odour.
Blending Suggestions: Cedarwood, Clove Bud, Rosemary and Thyme.

Grapefruit (Pink) Essential Oil is a pink to orange-pink, thin liquid that has the fresh, sweet citrus aroma that is very characteristic of Pink Grapefruit. While there is little difference between the Pink and the White variety of Grapefruit Essential Oils, Pink is known to be slightly sweeter.
Blending Suggestions: Lemon, Palmarosa, Bergamot, Orange, Rosemary, Cypress, Lavender, Geranium, Cardamom.

Eucalyptus Lemon Essential Oil is a colourless or pale yellow liquid with a strong, fresh, citronella-like odour and a sweet balsamic undertone.
Blending Suggestions: Cedarwood, Lavender, Sweet Basil, Palmarosa, Peppermint, Rosemary, Thyme, Frankincense

Rosemary Essential Oil is a colourless or pale yellow thin liquid with a strong, fresh, minty-herbaceous scent and a woodsy-balsamic undertone.
Blending Suggestions: Lavender, Lavandin, Citronella, Thyme, Pine, Basil, Peppermint, Cedarwood, Petitgrain, Cinnamon.

Orange 5 Fold Essential Oil is a thin, dark orange to golden brown liquid with a strong orange peel scent.
Blending Suggestions: Bergamot, Clove Bud, Lavender, Lemon, Clary Sage, Myrrh, Cinnamon.

Pine Needle Essential Oil is a colourless or pale yellow liquid. It has a strong, dry-balsamic, turpentine like aroma.
Blending Suggestions: Cedarwood, Rosemary, Tea Tree, Sage, Lavender, Juniper, Lemon, Eucalyptus.

Xanthan Gum is an off white powder that's commonly used as a thickener and stabilizing agent.

Clove Bud Essential Oil is a pale yellow liquid with a sweet-spicy odour and a fruity-fresh top note.
Blending Suggestions: Rose, Lavender, Vanilla, Clary Sage, Bergamot, Lavandin, Ylang Ylang.