I am sorry Minties - that old man time has caught up with me again and i have been too snowed under by the general busines of managing two children and an old mother, to get on to the next part of this, but here iam back just in the nick of time!
The most important thing about these activities is that they are very cheap. Instead of shelling oput a lot of money for paints, i make mine ..
I use food colouring from the supermarket, you need the bottles that cost anything from 80cents to a dollar - they come in green, blue, pink, red, yellow and sometimes you can get coccineal and black. I dont tend to use the coccineal, and the black is good when you can get it. You mix them to get other colours :
red + Blue =purple; red+yellow = orange; blue and yellow =green shades -
If you want pastels, you can just add your food colouring to white paint - probably poster paint but i just buy a litre of whatever is cheap. I find I can never get a really good purple either, so i like to keep purple paint, but some workers i have known do perfect purples so just experiment.
If you want watercolour paint, you can use food colouring straight : it turns out very dark and intense. It works better to mix it with water, and you'll need to experiment to see what dilution you want on the day.
If you want hard, shiny, vibrant paint, mix food colouring with PVA glue : This is my absolute bestest favourite because then the children can stick stuff on to it and build up layers. It takes a bit of mixing, but it will keep in tightly lidded pots or bottles (as will water paint), indefinitely and it won't need refrigeration. I suppose PVA is my big extravagance because it has so many good uses - it costs be about $20 for 5 litres from a wholesale educaional supplies company - the prices seem to go up and down. I have also found KMArt quite reasonably priced for smaller quantities ( half the price of places like mitre10 )
Now for a paint that is also great ( I love it but a lot of people dont!) CORNFLOUR PAINT : this is a reliable recipe. It keeps for up to about ten days, tightly lidded in the fridge:
1/2 a cup of cornflour
1/2 a cup of cold water
4 cups of boiling water
small lidded containers for your paint
andof course food colouring
1/. mix your cornflour with cold water
2/.stir in boiling water (it will go very thick) Leave to cool - if it doesn't thicken, put it in a saucepan and stir it until it thickens.
3/. when cool, spoon into containers and mix in food colouring.For more intense colour, add more colouring. If you want a thinner paint, stir in cool water.
They say that if you want a glossy finish you can stir in a little dishwashing detergent, and if you want a matte finish stir in liquid starch - i have never had really good results doing it that way. If i want it glossy, I get the child to go back to it when it i s dry and paint over it with neat PVA glue.
You can also use cornflour paint as glue, with or without the colour added. It isn't a strong glue, but it will past piecs of paper together with no problem at all.
Just a note about brushes
Lots of people will tell you there are all sorts of age/stage appropriate rules for paint bushes. You can toss a lot of that out the window. Think safety: If it is a long skinny brush, a lot of toddlers might be tempted to poke it somewhere it shouldnt be poked, or to poke someone else in the eye just to see what will happen. A baby is probably better using fingers or sponges to paint with. ou need a wide variety of painting implements, and the less safe, the higher will have to be the level of supervision.
Don't just leave it at painting, offer a wide range of other materials: crayons, felt pencils, scraping implements and some collage stuff. Let them experiment.
Supervision
Sorry mum, but this word doesn't mean you watch and the child plays : If you dont engage with the experience, you will always have trouble engaging the child. You need to be working alongside your child, getting your hands dirty and all that. I have even got it in my hair from time to time and i regularly get it on my hands, face and clothes.Dont worry, that's what showers and washing machines were invented for.