French to English Tech/Engineering Printing & Publishing

Printing instructions:

For logos:
"VERSION “NÉGATIVE“ : Elle est utilisée sur fond noir ou coloré (cf packaging), sans restriction dès lors que la couleur appartient à l’univers chromatique de la marque. Le logotype est obligatoirement ***en réserve***."

For business cards:
"COORDONNÉES : Composées en Frutiger light, en réserve, fer à gauche."

Accompanying images show that the logo/text in question is white on a colored background (white is the color of the underlying paper). Is there a technical term for this? "Printed in white," for example, wouldn't work in the case for logos printed "en réserve" on cardboard packaging (the absence of ink would result in a cardboard-colored logo, not a white one). GDT gives "resist", but this term appears to apply only to textiles and the like, not paper (involves using wax, for example, to prevent ink to adhering to certain areas).

TIA