ES280788A1 - A procedure for the preparation of a developer for the positive diazotypic process (Machine-translation by Google Translate, not legally binding)
- Google Patents
A procedure for the preparation of a developer for the positive diazotypic process (Machine-translation by Google Translate, not legally binding)
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Grinten Chem L V D
Chemische Fabriek L Van der Grinten NV
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Grinten Chem L V D
Chemische Fabriek L Van der Grinten NV
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Organic Low-Molecular-Weight Compounds And Preparation Thereof
(AREA)
Abstract
A process for the preparation of a weakly acidic developer in a liquid or solid state for the positive diazotypic process, which developer, in the ready-to-use form, is an aqueous acid reaction solution containing phloroglucin as a single or major coupling component. as a buffer salt and with which a one component diazotypic material can be developed according to the so-called semi-wet (semi-dry) method in which a thin layer of the developer liquid is spread over the surface of the diazotypic material exposed to the image, characterized in that the buffer salt used consists of dipotassium maleate and/or dilithic maleate or substances which, when dissolved in water, are capable of reacting with each other with formation of these salts, and a relatively small amount of an acid is added. or of a water-soluble acid reaction salt, as a result of which the developer in the ready-to-use form has a p H between 6.5 and 7. (Machine-translation by Google Translate, not legally binding)
ES0280788A1961-09-151962-09-14A procedure for the preparation of a developer for the positive diazotypic process (Machine-translation by Google Translate, not legally binding)
ExpiredES280788A1
(en)