I'm not sure if you can see from my photo, but this antique wooden carved candlestick had originally been painted in a strange dun coloured, greyish-brown colour, that has now mostly disappeared.
When I was at college most of our painting from life, or still-life, was done either standing at an easel, or sitting on what I think were called 'Donkeys'.
'Donkeys' were a type of long stool or bench that you straddled, and propped your pad or canvas at the far end.
Traditionally at the end of the day, you scraped your palette clean, and deposited the multi-coloured scrapings underneath the far end of the Donkey. After a build-up of paint, it could be scraped off and used as background colour, to take away any vestige of white on your canvas.
The colour when mixed homogenously was amusingly known as 'Bench-end'.
I was handling the candle stick recently, and came to the conclusion that its original colour was indeed 'Bench-end'. Whether or not this came from an end of day build-up of unwanted colours is not known.