$IQt MARKING COLOUR yo* LINEN, &C* 



Section IV. 

 Marks printed If care be taken in the procefs of difengaging oxigen gas 

 Txide^f man- ^ om a mixlure oi " llle H^k oxide of manganefe and fulphuric 

 gancfe obtained a^io^ r^pt to carry the lire to ignition, the ("aline retidue re- 

 wfi^S'fuVhate, ™^- S ^ la V kin) ' inftead of becoming yellowim white by thong 

 afford fixed "eat. When this refidue is diffolved in water, it leaves 

 marks i b) fimple behind it an oxide of" a deep grey, which acquires a very 

 party continence on the filtre. This oxide mixed with a very 

 little water thickened with gum adragant, may be ufed to print 

 marks of a very deep grey, which dries fpeedily j and this 

 colour does not wafh out with water, even though the fub- 

 fequent dipping in an alkali be omitted. It is fo fixed that 

 it not only fupports the action of all acids of the manufactur- 

 ing ftrengths, but likewife all the bleaching and printing 

 procefles without attracting the colouring matter of any dye 

 whatever. 



Setiion V. 



Addition of the If there were no reafon to fear injuring in a {light degree 

 nitro muriate of ^ j ace w j )ere l } ]e ma fa j s m ^ e \i VVO uId be advantageous 

 tin to the mark- ■".-'./' « 



ing oxide. It to employ equal parts or the Iaft defcribed grey pafte, and 

 affords a dye. f a ni [ T0 muriatic folution of tin, containing one fourth part 

 of the metal, and thickened with gum-adragalh. Tliis 

 colour is as unalterable as that of the fourth feclion ; and it 

 has the additional advantage, that its oxide of tin being fa- 

 turated with oxide of oxigen, attracts the colouring parts of 

 any tinclurc, and acquires a puce colour by madder. I muff, 

 oblerve on this occafion, that by the fame madder dye, the 

 colours of marks from the oxide of manganefe laturated with 

 oxigen, become of a deep puce colour, inclining to black, 

 whereas in a lefs oxigenated ftate they acquire fainter (hades. 

 In all thefe circumflances however, it is requifite, that the 

 quantity of metallic oxide mould be as great as polTible, other- 

 wife the (hades will be various, and leis interne. 



Sea ion VI. 



Experiment ^ s mall y » n C°^ D ^ metallic oxides acquire the property of 



with the pre- adhering to -fluffs by means of acid, I did not fail to try whether 

 cipiute or man- ^ p e vvon {j jj e t | ie ca f e w j t jj t j ]e precipitate of manganefe 



tionoriron. faturated with oxigen. For this pvirpofe I ditfblved oue pari 



