. Penman's Art Journal and Teachers' Guide . on, theink should contain mure than one kind ofcoloring matter; as, for example, the oldtannogallate of iron plus indigo or anilineblack, and perhaps a little copper salt. NoBingle chemical agent could bleach all ofthese, and neither paper nor parchment canstand a series of chemical aoWenta. Theaniline inks, now largely used, are of veryquestionable durability. It is uncerUinwhether they can endure the action of timealone. Supplemented with the old-fash-ioned iron salt, which has proved \la dura-bility, ihey are safe. It should always beunderstood t
. Penman's Art Journal and Teachers' Guide . on, theink should contain mure than one kind ofcoloring matter; as, for example, the oldtannogallate of iron plus indigo or anilineblack, and perhaps a little copper salt. NoBingle chemical agent could bleach all ofthese, and neither paper nor parchment canstand a series of chemical aoWenta. Theaniline inks, now largely used, are of veryquestionable durability. It is uncerUinwhether they can endure the action of timealone. Supplemented with the old-fash-ioned iron salt, which has proved \la dura-bility, ihey are safe. It should always beunderstood that the indelibility of any inklargely depends upon the nature of the sur-face to which it is applied. The moreabsorbent the paper, the more difficult i» it^removal, as it penetrates below the surfaceof such paper. If the paper is highlyglazed, by covering it with any kind of var-nishing material the possibility of removingthe whole surface—varnish, ink, and all, isincreafied.— The Gentleman** Magajtine. THE DAY SPACINGShading T Square. READ THIS FIRST!
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Keywords: ., bookcentury1800, bookdecade1880, bookidpenmansartjo, bookyear1884
