[D'après NOLDUS 2008, p. 171-173:] 14 Mais passons. Faire des cartons, {Faire des Cartons est utile.} de la même taille que votre ouvrage, est utile et pratique, si la composition est solide et valeureuse. Ils vous faciliteront le travail, car en les accrochant devant vous, vous ne risquez pas de vous égarer, ni perdre de vue ce qui est essentiel. Mais vous essayerez d’appliquer les clairs et les sombres en suivant votre modèle. 15. En effet, votre carton doit ressembler à une peinture, avec des clairs et des sombres sur la couleur de fond, {Il faut appliquer des clairs dans les Cartons.} de sorte qu’il n’y ait pas la moindre imperfection dans les contrastes, les enfoncements, les volumes, le relief, la douceur, la fluidité, l’union et la perspective. Vous ne devez pas vous laisser décourager trop facilement par le travail, mais aspirer avec diligence à atteindre la plus grande bienséance.

[suggested translation, Marije Osnabrugge:] As the Amateur will often find the building up , shadowing, deepening and heightening discussed in the continuation of this Verlichterie-Kunde, as they are the principal actions in the practice of Watercolouring; as such it is necessary, to briefly mention something for the profound understanding of them, because one cannot acquire a perfect practice of this Art, without profound knowledge of it. We start first by explaining the building up, being the start of all that one wants to do in this Art. Building up is, when one builds up a thing, with any Colour of Paint that one choses for it, flat and uniformly as is desired and simply covers, without paying attention to any shadow or light. Built up, once the paint is dry, one continues by shadowing and deepening, as we will call it from now on; and it is done on the ground, which was build up beforehand; it is always done by means of a colour that is greasier, stronger or darker than the one with which it was build up: because of which the Parts of dark and light are discerned and framed; that is, that one can recognize the shadows and flatness of things, and see them rise, while they appeared to be flat before; [...] The third observation now is heightening, which should happen at the light spot of all things, where the light falls strongest without any shadow; and this heightening mostly occurs on high and protruding parts, such as on Humans on the Jaws, on top of the Nose, on the Forehead, Chin, Shoulders, Breast, Buttocks, Elbow, Knees, etc. . Similarly in Clothing on the folds, and flat parts of Limbs that are expressed by it; and furthermore everything that raises itself above the surface; this is done with a lighter Paint and happier Colour, as the one with which it is build up: and heighten it in a way as it is lit up more or less according to its level, towards the strongest light, to round it and make come forward, etc. [...] now the shadows that are made on the grounded Paper, also coincide with the shadows that, in Painting, one places over the first layer with a stronger Paint; the highlights also coincide; the depths accord with the touches, that are placed here and there in the Drawing; and there is no difference between Drawing and Illumination-painting, as the handling of the Brush, and that one often imagines that every applied Colour on which one has to Paint, is a kind of grounded paper on which one Draws, and that one practices the manner of Drawing beforehand, which is called washing. It may also be remarked, that one should always place the shadows, depths, highlights, after the Colour of the ground-surface, on which it is placed: because if these are not corresponding , they will be too hard – if they are too strong – or too weak and Buttermilk-like – if they are not sufficiently strong.

[BLANC J, 2006, p.111] {poser [ndr: les ombres] à l'aide de taches}. Mais que vous commenciez ou que vous terminiez par les ombres, vous devez les répartir, dans votre esprit, en fonction de leur intensité plus ou moins forte, et indiquer chacune d'entre elles par rapport au brun qui lui convient, à l'aide de taches. En dégradant et en fondant excessivement, vous donnerez en effet à l'ensemble de votre oeuvre l'aspect du cuivre, et vous en perdriez même le jugement. Ne vous ennuyez pas à faire de petits cernes sur une ombre douce ou à lui coller de trop près une ombre plus brune encore. Sa force sera supérieure si vous la placer plus loin. Ainsi, vous vous habituerez à comparer les parties entre elles, et vous tirerez finalement plus d'utilité de cette façon de faire que vous n'auriez jamais osé l'imaginer. En revanche, en retouchant de façon douce et estompée, vous courez le risque de vous égarer totalement, comme cela est arrivé à de nombreuses nobles âmes qui, par quelque penchant pour leurs oeuvres, les sucrent et les renforcent de creux et de rehauts.

[suggested translation, Marije Osnabrugge:] The most easy and adequate manner, is certainly the best, notwithstanding that there are many in use and investigated by me: such as the drawing with pen, brush, red or black crayon, yet all of little use for painters. But through the manner of heightening on grounded paper, and deepening with black; it surpasses all the others, both in perfection and in usefulness: firstly satisfying our eye because of the elevation, without the necessity to make any ground for it. As it is seen from Engravers, who practice the black art, which they embellish by scraping on a grounded plate: and it is unbelievable, how easy and capably they do this, which they would not do in etching or engraving.

In the German translation, this paragraph is part of the discussion between Judicio and Probus, this statement is made by Probus. It appears that the translator made a mistake here. [MO]