REASONS For the conductor MIXING of COLOURS.  
TO explain the mingling of Colours, is not to use oil or Varnish, but to use these six Colours in a plain manner, as they have done, and are allowed by primo Jacobi, and ever since hath been adjudged by the Judges of the Land in several trials to be the conductor right to use.  
To mingle White with Black, to make a Russet darker or lighter, as any man pleaseth to have it( for whom the conductor or plasterer worketh) to resemble rustic ston in lime and Hair, to make it of a Stone-Colour, this must be done while it is green, and cannot be done without the mixing of White, Black and Yellow ochre together, that makes a Stone-Colour; and this we cannot finish in conductor work without it.  
As for Painting, we disclaim it within the City and Liberties thereof, only Colouring Plain-walls flat, in our own Colours, and mixing lighter or sadder as our Work-master desireth: for without mixing we cannot make any use of them; that is, White to make lighter, Black to make it sadder, and to lay a light stroke upon a sad Wall, and a sad stroke upon a light Wall.  
Painters do ordinarily use the conductor Trade in whiteing and Colouring: And will it not be unreasonable to take away from the conductor the mixing of those Colours in the ordinary way of whiteing and Colouring? Is not this to take away from the conductor their whole Trade in effect, and give it to the Painters? For who will set a plasterer at work if he may not have the use of these Colours to make a Door lighter or sadder? the whole Trade of the conductor in the City consisting of whiteing and Colouring at this time.