Heliogravure IV – Some Overall Thoughts

Heliogravure has some particular characteristics that don't facilitates the system calibration in order to arrive to a sort of WYSIWYG. Working from a film negative, it is a different experience if the user prints the negative on photographic paper before to perform the heliogravure or passes directly to the heliogravure. In the first option, what …

First Heliogravure Print

After some troubles and a quantity of trials with Grayscale step wedges, here is my first Heliogravure image. The plate measures 145x165mm and the image 120x120mm. I have used an stochastic screen digitally designed and printed on high contrast photographic film in a Pre-press service bureau. The digital image was edited in Adobe Photoshop and …

Heliogravure III – Ultraviolet Light with Digital Screen

Updated 26/01/2016 Hardening the gelatin. In heliogravure, it is necessary an illumination source rich in ultraviolet (UV) light. This UV light must provoke the cross link reaction into the gelatin previously sensitized with potassium bichromate (K2Cr2O7). This reaction is explained by several and sometimes slightly different theories. Luis Hernández (2), explains that the UV light …

Heliogravure II – Stochastic Screen

The Aquatint Screen As described in the technique of heliogravure, it is necessary to have some screen to illuminate the gelatinized paper or carbon tissue in order to bypass the use of a resin or asphalt aquatint. The resin or asphalt powder is applied by means of the called resin or aquatint boxes, where the …

Heliograbado III – Luz Ultravioleta

Endurecimiento de la gelatina En el caso del heliograbado, se necesita una fuente de iluminación rica en rayos ultravioleta (UV) que provoque la polimerización (cross link) de la gelatina sensibilizada con dicromato de potasio (K2Cr2O7). Según Luis Hernández (2) la luz UV actúa sobre la gelatina dicromatada generando un efecto de curtido. La reacción consiste …