Lifting Out and Preserving the White of the Paper
A pure water colourist will use the white of the paper and not add Chinese white of Gouache to make white. Personally if I need to use white I don’t see any harm in doing so and don’t think that this method deserves to be frowned upon. However I must have a look and sample all the other methods that are available to retain the white. Sometimes it is impossible with some methods to fully get back the white of the paper due to the staining pigments within the watercolour paint. All of the methods need to be done quickly and whilst the paint is still damp and not totally bone dry. Some of the methods mentioned you really need to be very careful with as you could so easily damage the paper and not be able to repair it.