Use the minimum amount of medium to serve a particular purpose. Most experts agree that oil paintings done with straight paint (no mediums except a little thinner) form the strongest, most permanent films

Gamblin Artists' Oil Colors
Holbein Artists' Oil Colors and Duo Aqua Oil Colors
Winsor & Newton Artists' Oil Colours, Oil Bars,  Winton Oil Colours, Griffin Alkyd Colours, and Artisan Water
Mixable Oil Colours
Graham Artist Oils
Marshall's Photo Oils

Liquitex Heavy Body Acrylic Colors and medium Viscosity Acrylic Jar Colors
Winsor & Newton Finity Artist Acrylic Colours and Galeria Acrylic Colours
Graham Artist Acrylics
Van Gogh Acrylic Colors
Createx Airbrush Acrylic Colors

Winsor & Newton Artists' Water    Colours, Cotman Water Colours and Designers Gouache Colours
Holbein Artist Water Colors, Designer Gouache and Acryla Gouache
Graham Artist Watercolors
Dr. Martin's Water Colors

Prismacolor Water Color Pencils
Derwent Water Colour Pencils
Staedtler Karat Water Colour Pencils

Great American Art Works Hand Made Soft Pastels
Rembrandt Soft Pastels
Unison Soft Pastels
Winsor & Newton Artists' Soft Pastels
Schminke Extra Soft Pastels
Sennelier Extra Soft Pastels
Prismacolor Nupastel Firm Pastels
Holbein Artists' Water-Soluble Pastels
Conte Pastel Pencils
Stabilo CarbOthello Pencils
Conte Crayons
Alphacolor Soft Pastels

Holbein Oil Pastels and Artists' Oil Pastels
Pentel Oil Pastels
Winsor & Newton Artists' Oilbars

Gamblin Oil Mediums Including Galkyd, Galkyd Lite, Gamsol and Neo Megilp
Liquitex Gesso, Colored Gesso, Acrylic Mediums, Texture Mediums & Varnishes
Winsor & Newton Acrylic Mediums &  Varnishes, Oil Mediums, Thinners & Varnishes, Water Colour Mediums & Masking Fluids

Holbein Painting Mediums
Krylon Spray Gesso, Varnishes & Fixatives
ProArt Gesso
Misc. Specialty Mediums

Prismacolor Art Pencils
Verithin Colored Pencils
Derwent Artists' Pencils
Marshall's Photo Pencils
China Markers

Staedtler Drawing Pencils
Derwent Drawing & Sketching Pencils
Woodless Pencils
Graphite Sticks
Lithographic Pencils & Crayons

Conte, General, Lyra, and Ritmo Charcoal  Pencils (Ex-Soft, Soft, Med, Hard)
Cretacolor Compressed Sticks (Soft, Med, Hard)
Grumbacher and Winsor & Newton Vine and Willow Sticks

Stumps, tortillions, chamois, pencil sharpeners, and more

Sanford Design Kneaded, Gum,  White Plastic & Pink Pearl Erasers
Staedtler and Koh-I-Noor Plastic Erasers

Winsor & Newton Calligraphy Inks and Drawing Inks
F.W. Acrylic Artists' Inks and  Pearlescent Liquid Acrylic Drawing Inks
Higgins Drawing Inks

Manuscript Fountain Pens, Nibs,  Sets & Accessories
Sheaffer Calligraphy Pens and Sets
Speedball Pens and Holders

Painters Paint pens
Tombo Brush pens
Highlighters
Extra broad sign markers
Correction pens