The practical printer : a complete manual of photographic printing (1874)
Hearn, Charles W · Philadelphia : Benerman & Wilson · leaf 36
phite there, the rich color of the test solu¬ tion will not be lost, although its deepness may be weakened. When the latter is the case, the filtering-paper does not have anything in its composition that will be at all injurious to the bath when filtered through it. When, preparing to filter your… … If it filters too quickly, i. e., imperfectly, then press the cotton down further in the neck of the funnel ; if too slowly, then place the glass rod in the centre of the filter, turn it round once or twice, so as to catch hold of the cotton, and then pull it up very slightly. i
Photography -- Printing processes · Photographs on porcelain
Internet Archive · Getty Research Institute · Public domain (published before 1931). Free to use for anything.
![An illustration from One thousand processes in manufactures and experiments in chemistry / [Colin Mackenzie]. (1825)](https://img.insideoutlibrary.com/img/200/wellcome-wellcome_b29307867-212-1.webp)
![An illustration from St. Nicholas [serial] (1873)](https://img.insideoutlibrary.com/img/200/ia-stnicholasserial381dodg-344-429.webp)
