'Veladura' is 'glaze'.

La veladura consiste en capas muy delgadas de pintura, de forma que se transparente la capa inferior, así el color que se ve es el resultado suavizado de la mezcla del color inferior más el de la veladura.1

Para realizar una veladura es necesario que la capa inferior esté perfectamente seca. Dicha capa inferior puede ser de óleo o de acrílico, pero nunca debe hacerse al contrario, es decir, no debe pintarse acrílico sobre óleo.

https://es.wikipedia.org/wiki/Veladura

When the technique is used for wall glazing, the entire surface is covered, often showing traces of texture (French brush, parchment, striae, rag rolling). Either oil-based or water-based materials are used for glazing walls, depending upon the desired effect. Kerosene or linseed oil may be used to extend the "open" or working time of oil-based glazes. Water-based glazes are sometimes thinned with glycerin or another wetting agent to extend the working time. In general, water glazes are best suited to rougher textures where overlaps of color are acceptable.

https://en.wikipedia.org/wiki/Glaze_(painting_technique)

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Glaze paints are ideally suited „to refine“ most various substrates. They provide
surfaces that captivate the eye of the oberserver with the exciting interplay between calm homogeneity and lively transparency of a glaze finish.

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