طبع السلبية على الورق الحساس و عمل بروفة تلامسية .. كتاب فن التحميض والطبع والتكبير

Second: Print the negative on sensitive paper and make a touch rehearsal

The negative is not given a picture that is inherently worth seeing unless its area is large (at least 6 x 6) because the area of ​​the paper image is the same as the area of ​​the negative. This image contains most of the defects and features of the negative from which it was printed, as we cannot intervene to fix the defects. It is preferable to use slow chloride paper or chlorobromide paper at medium speed over very fast bromide paper. The printing process can be done with a red or orange safety light such as a safety light with a Wratten = OA filter installed.

The process of printing or rehearsal of the negatives is done by means of a printing device «see Chapter One of Chapter One or by a rehearsal printer, or simply by means of a plate of glass. And you get the exposure light from a lamp at a height of about 60 cm, or from the light of the magnifier, or from the light of the printer lamp.

When printing with a platen glass, you first place the photosensitive paper on a flat surface with the photosensitive surface facing up. The sensitive surface is known in the dark by holding the edge of the paper with a slightly wet finger. We find that the sensitive surface sticks to the finger. Likewise, the sensitive paper may be curved towards the sensitive surface, then we place the negative on top of the sensitive paper, so that the two sensitive surfaces touch, and we know the sensitive surface of the film as being matte and it is The film is curved towards it, then we lose the glass plate over the film to make the film

and sensitive paper are adjacent to each other

Expose sensitive paper to light (for example, a 40-watt bulb at a height of about 60 cm). For a period we know from experience, a magnifying light can be used. Always note that you write this information so as not to forget. It is preferable to write it in pencil on the back of the sensitive paper or in a special notebook.

As for the printing device (you can make it at home), the arrangement is as follows: the film first on the device’s glass and its sensitive surface upwards, then the sensitive paper. And its sensitive surface downwards, attached to the sensitive surface of the film, then the device cover.