Oideas Gael keep some art staples in their bookshop but it's good if you can bring along what you need as their sock is limited.
Well that depends on your medium but really I'd like everyone to have a sketchpad and some pencils/pens as a minimum. You need to be able to make some notes. The A4/A3 hardback ones (not ruled!) are best for quick sketches, Easons sometimes do multiple packs for a reasonable price. Critical thing here is that you aren't precious about the paper.
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Depending on your preferred medium you may want:
Oils: Paints, Hog hair Brushes, palette knife for mixing / painting, canvas/canvas boards. Some rags or kitchen roll to help with wiping and cleaning brushes. For painting with oils indoors (and outdoors) you should bring some 'Sansodor' as a substitute for smelly environmentally bad solvent based white spirit/turps (which may be used outdoors). Also Liquin medium will help with faster drying of the oil paint if you can get it. I'll bring some odourless 'Clean Spirit' for cleaning brushes.
Acrylic: Paints, Brushes, an acrylic paper pad or some canvases/boards. Optional extras are: A stay wet palette (you can make one from an old Ferrero Roche plastic box, just bring the box an I'll show you), a little water diffuser, water jars and some water and some rags/kitchen roll. Painting knife if you want.
Paint colours: If just starting keep it simple and get some big 200/225ml tubes if you can of Titanium white, Ultramarine Blue, Yellow Ochre and a red - say Venetian red. These are all the cheapest pigments. We avoid using black!!! In oils 'Winton' is okay but the 'professional' colours have more pigment so they are better. Similarly in acrylic 'System 3' is okay to start with but you will move on to more professional paint with time. Important thing is that the materials are not so costly that you become too precious with them.
Watercolour: Paints (I like the little Reeves tins of 12 colours), Sable Brushes, Some white mixing space eg small saucer, Water container and a couple of small plastic cups (one for clean water and one to clean brushes), Watercolour paper - preferably the pre stretched paper in a gummed block.
Ink: Little bottle of chinese ink. Cost from around £3.00. Drawing tools - sticks or bamboo pen. Brush for washes. Thick paper/watercolour paper. Some pots for washes, sea shells work well. Water bottle.
Conté: Conte crayons, paper with some tooth. Optional: spray fixative.
Charcoal: Willow
Pencil: 2b, 4b, 6b. A hard backed sketch pad (A4 size if you're not sure) and a sharpener. Optional: and a bulldog clip (to clamp your sketchbook open and closed) and a Staedler white rubber.
Graphics Pen: Range of Widths eg 0.1, 0.3, 0.5. You can buy these in a pack (I use Mitsubishi uni pin). Smooth paper sketchpad. The smooth paper is good as it will allow the pens to glide over the page.
Setup:
Whatever you need for being outdoors but a small folding stool is good or you can take a plastic chair from Oideas Gael or find a 'natural' seat. You need a plastic bag or backpack for your stuff. Optional: A 'backpack stool' is good as it holds your stuff and folds out to sit on (great as hand luggage at airports as you can sit in the queue, look up 'fishing stool' online for options, zip pockets are best if you can get them otherwise you loose stuff). An easel is good for painting work, some of these are available at Oideas Gael but bring your own if you have one.
The weather:
A sturdy pair of shoes for walking. Clothing layers, a hat to keep the sun off, suncream and sunglasses for looking at your (briefly) white canvas/paper in the sun. And just in case it rains: umbrella and a rain jacket.
Other Stuff:
Digital camera or tablet: Good if you want to take some snaps to work on later or at home.
Old clothes! We gotta splash that paint about when we're outdoors!
Drinking water.
Snacks/ lunch depending on location.