In one book I have a paint-out of just about every Daniel Smith watercolour, with notes, pigment information, comparisons with other brands, mixing trials and so on. Another book has brief information on every paint I have tried recently arranged by colour. The third, and most useful for sharing comparisons, is a set of cards, one for each colour, that were pictured in a previous blog here. Others books contain test colour mixing...and so on.
I was asked how I set about making these cards so will share it here.
I used Cotman 190gsm paper since it is a little thinner than my usual 300gsm and I was making a large number of cards so I didn't want too much bulk. Note that it is best to test your colours on the paper you are using, or at least all on the same paper to compare results. The paper I used was from an A2 pad, which I ruled into rows all down the page, that is, lots of horizontal lines 4 inches apart. I then used my metal ruler, which happened to be 3cm wide, and a blade, to cut the paper into strips the width of the ruler.
So I had a load of strips 3cm wide with lines down them every 4 inches.
I hope you can picture that.
I then used a stencil to draw the rectangles and squares on them to paint in my watercolour washes. You do have to make sure your method doesn't confuse the front and back of the paper. If you cut them into cards before drawing on them they can flip around easily.
When you are doing a lot of repetitive work you need to find a few short cuts. Sometimes it is worth making my own stencil, sometimes it is worth just repositioning a bought one. I used a Mathomat - a rather wonderful thing I think with all sorts of lovely shapes - to draw the shapes on rather than measuring them up individually. You could of course do free-hand washes. Using the various edges to measure distances between the shapes, I drew on the rectangle at the bottom first, then the square, the the other rectangle above the square, then the two small squares at the bottom.