Eventually, having succeeded in sorting out all but one of my niggling problems, I felt I'd earned a little time with my paintbrush and paper before lunch. I enjoyed making the collage birthday cards for two of my grandsons who will shortly be reaching the age where it's so difficult to find a suitable birthday card for them - ie double figures! But after all those bold colours, I wanted a change to something rather more flowery and feminine for a girls' birthday card. So I went back to using tissue paper - coloured this time - and had fun using up some of the dried up gouache in my palettes.
Again, my hope was that those palettes would be much easier to clean by the time I'd scrubbed the paint with a big bristle brush until I'd produced the colour I wanted to paint the tissue. (You may have noticed that I don't like cleaning palettes - it seems such a chore after using pastels for a long time!) I've found that it's very important to get the consistency of the paint just right when painting tissue paper - not so thick that it drags on the paper and weighs it down. But on the other hand, it can't be so watery that the paper disintegrates - you'll soon discover what works best through trial and error. And, by the way, watered down poster or powder paints are also suitable as long as you find the right consistency.
A little white gouache (or poster colour) works well where your thin wash of colour might well not show up at all on the darker colour of tissue. I find a 'dabbing' movement with the brush gives me an informal, natural look for flower petals, butterflies and so on - again, don't 'dab' at the paper too vigorously. Tissue paper becomes quite fragile when it's wet and could easily tear. (But if it does tear, don't worry too much; you can probably avoid the tears when you come to the cutting out as long as you are using smallish pieces.)
With the 'Happy Birthday' again added in paint.net (which is SO like Photoshop - but free!), because I'm rubbish at lettering, this is how it turned out -
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