Colours in The Night Watch

From the series Operation Night Watch
The Night Watch Militia Company of District II under the Command of Captain Frans Banninck Cocq Rembrandt van Rijn (1606-1669), oil on canvas, 1642

One thing is clear: Anyone who looks at The Night Watch today does not see the same thing as when the painting was just created. Colours have changed over the centuries. What paints did Rembrandt use and how did they change in appearance?