โ Scribed by Lessinc, R.
No coin nor oath required. For personal study only.
pract,ically nll rcqiiire p i n t s made spccificnlly for tlic purposc.
The following thrcc vnrioblcs nlso entcr iiito tlic making of thc product: tlic kind and quality of oil, thc pignicnts nsctl, slid tlic Iciq$li of tiiuc tlint the drier hns becn mised with tlic oil.
Tlic Iciiid and qnnlity of tlic oil refers to whctlicr it is linsccd, chinii wood, perilln, fish, or soya bcnn, and wlicthcr i t is a n old oxidiscd oil, n blomn oil, a 1101~nicriscd oil, :L frcsh raw oil, or n boiled oil. Many conibinntious of t.lic above oils arc uscd. Wood oil niid pcrilln are gcneriilly usccl ns polymcriscd oils ; linsccd, fish, and sopa bcnli oils are uscd in all forms. Thc Iiist two arc very slo\v-ilrying and require spccinl conibination of tlic driers, wliicli gcncrnlly contniii higher pcrcciitngcs of cobalt thin is iicccssary for tlic othcr oils.
Thc pignicnts iisetl h v c i t coiisirlcrihlc 1)c:iring ujIon tlic drying of p i n t . To tcst tliis, p i n t s wcre inade u p nsing tlic s:iinc oil throughout iind tlic following pigments : 1)il rn~iitro:iriilinc rcd, silic;k, nsbcstine, biwytcs, wliitc lend, li tliopone, zinc ositlc, oclirc, chronic grecii: ultrnmnri~~r: l h c . :intiinony ositlc, ciirboii blnclt, iron osidc, iuiibcr, 1c:itl chronintc (ycllow), rind Cliiiicsc blnc. Tlicsc pnints \wrc nintlc of tlic sninc consistciicp, so thnt wlicn applicrl \rc would get tlic snnic tliickncss of film. Tlic drying tinics rimgcrl from ti Iirs. for Icail, zinc, iintl lithoponc, to 26 hrs. for Cliincsc bliic ;it 70" B. Para rcd, silicn, i~sl~estinc, :i.iicl lcnd chromntc do not nficct drying. Oclirc, cliromc grecn, ultrn,niiirine bluc, antimony ositle, n n d cnr1)on black slow up clryiug somewlint becnusc t h y rcqiiircd prcicticnlly O iirs. to dry. Iron oxide, unibcr, 1x1 rytes, iuid Cliiiicsc bluc slow up dryiug considcrd~ly, tlic first requiring 13 Iirs. to dry, the nest two 17 Iirs., nntl tlie Inst 26 Iirs. It is quitc nppnrcnt that soine pigmcnt.~ inhibit the drying rcnction. This inay be due to prcfcrciitial ntlsorptioii of oxygen by the pigment,, or i t inny bc iluc t o sonic impiiritics in thc pigmcnt rdiicli poison tlic catalysts.
๐ SIMILAR VOLUMES
The e.p.r. and i.r. spectra of hand-picked samples of calcite from Pittsburgh No. 8 coal, show that it contains the Mn2+ paramagnetic ion and clay minerals as impurities. Furthermore, comparison of the e.p.r. spectra of hand-picked and natural calcite shows that the Mn2+ spectrum in this coal origin
## Report respectively. The corresponding values with microwave heating, 65, 72, 54 and 64% respectively, were significantly higher overall but with a different distribution. A full comparison with conventional methods has still to be made over the coal series, but microwave heating certainly acc