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Les produits. Exhibitions - Ryan McGinness. Toning Cyanotypes With, umm Tea! By on Sunday, July 25th, 2010 | No Comments It might sound strange but tea can be used to tone prints and works especially well with cyanotypes imparting a yellowy red tone to the highlights of the images and creating almost split toned effect which can be quite effective.

Toning Cyanotypes With, umm Tea!

Tea has a naturally high tannin content and it is these tannins that tone the print. To mix up a bath of tea toner, brew around 5 tea bags in a litre or quart of hot water (the tea bags diffuse quicker in hot water). The tea toner can be reused time and time again and works the same whether hot or cold. The time required to tone a print can vary from ten minutes to many hours, it just depends on the strength of the tea and the effect you are looking to achieve. Above is an example of the effect created when toning with tea, the print on the left is the untoned traditional cyanotype and the one on the right has been brewed for a couple of hours in the tea toner. MikeWare - Practical Instructions. Preparations for Alternative Printing All of the alternative processes described here have the same modus operandi in common, which entails hand-coating high quality paper with chemical sensitizer solutions to make papers for contact-printing large-format negatives by exposure to an ultraviolet light source.

MikeWare - Practical Instructions

These practical notes will enable you to equip yourself appropriately for any of the following processes. The Argyrotype Process This new 'user-friendly' iron-based silver printing process is a latter-day improvement on the nineteenth century processes of Kallitype, Van Dyke, Sepiaprint, Brownprint or Argentotype. The resulting print has better prospects of endurance and a finer gradation, and may be readily toned.

Les cyanotypes. Un article du site scienceamusante.net.

Les cyanotypes

La photochimie est une partie de la chimie qui étudie ce type de réactions provoquées par la lumière, c'est à dire les ondes électromagnétiques, ou photons. Fabriquer des cyanotypes est une belle expérience pour montrer que les produits chimiques peuvent réagir grâce à la lumière. Un mélange photosensible est utilisé sur une feuille pour reproduire une photographie monochrome.

On doit l'invention des cyanotypes à Sir John Herschel (1792-1871) en 1842[1]. Si la photographie vous intéresse, consultez aussi les expériences du sténopé et du photogramme. 1 Précautions Outre les précautions en chimie qui sont d'usage, cette expérience comporte les attentions suivantes : Les solutions préparées tâchent les vêtements et la peau et peuvent présenter une certaine nocivité en raison du ferricyanure de potassium et du formol . 2 Matériel et produits 3 Préparation des solutions Négatif (image imprimée sur transparent) et cyanotype correspondant.

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