I bought some mixing white after seeing a video in which it was used but by the time I came to think about it again, I’d forgotten its purpose – how was it different, and why use it? This video explains:
Titanium white is opaque and mutes and ‘pastelises’ a pigment while mixing white brightens the colour of the mixed pigment, maintains the colour saturation, and only subtly tints it.
This is my unscientific experiment:
Brightening, retaining saturation, being less opaque – this sounds like an ideal wash, whereas the alternative sounds more like robust coverage.
Mixing white vs titanium white: what is the difference. 2018. City Stationery Group SAL. Winsor and Newton. [online] Available at https://www.youtube.com/watch?v=hJQMiAYKHvk Accessed 12 June 2020.