74 
MicROGRAPHIA. 
well colour’d Yellow, and further and further from the edge, as the.li. 
uor grew thicker and thicker,this tincture appear'd deeper and deeper, 
b that near the blunt end,which was feven Inches fromthe edge and three 
| Inches and an half thick; it was of a deep and well colour'd Red. Now, 
| the clearer and.purer this tinGture be, the more lovely will the deep 
Scarlet be, and the fonler the tin¢ture be, thé more dirty will the Red 
appears fo that fome dirty tinétures have afforded their deepeft Red 
much of the colour of burnt Oker or Spazifh brown;others as lovely a co- 
lour as Vermilion, and fome much brighter ; but feveral others, according 
as the tinctures were worfe or more foul, exhibited various kinds of Reds, 
of very differing wer sc ; 
_ The other of thefe Wedges, I fill’d witha moft lovely tin¢ture of Cop- 
per, drawn from the filings of it,with fpirit of Urine, and this Wedge held 
as the former againft the Light, afforded all manner of Blues, from the 
fainteft to the deepeft, fo that I was in good hope by thele two,to have pro- 
due’d all the varieties of coloursimaginable ; for [thought by this means 
to have been able by placing the two Paral/elogram fides together, and 
the edges contrary A pas & 
as by looking through them in feveral places, and through feveralthick- 
nefies, 1 fhould have compounded, and confequently have een all thofe 
colours, which by other like compofitions of colours would have enfued, 
- Butinfteed of meeting with what I look’d for, I met with fomewhat 
more admirable ; and that was, that I found my felf utterly unable to fee 
through them when placed both together, though they were tranfparent 
enough when afunder 3 and though! could fee through twice the thick- 
| nefs,, when bothof them were fill'd with the fame colour'd liquors, whe- 
_ ther both with the Yellow, or both with the Blue, yet when one was filld 
with the Yellow, the other with the Blue,and both looked through, they 
both, ‘d dark, onely when. the parts near the tops oe look’d 
croug » they exhibited Greens, and thofé of very great variety, asI ex: 
pected,but the Purples and other colours, could not by any meansmake, _ 
whether I endeavour'd to look through thent both againft the Sun, or 
whether I plac’d them againft the hole of a darkned room. St 
But notwithftanding this mif-ghefling, | proceeded on with my trialin 
a darkroom, and having two holes near one-another, I wasiable, by — 
placing By Wedges again{t them,to mix the ting’d Rays that vallabeouiee 
them, and fell ona ) of white Pa Secitoats convenient diftance 
from them as I pleads fo that I could make the Paper appear of what — 
colour I would,by varying the thicknefles of the Wedges,and confequent> 
ly the tincture of the Rays that paft through the two holes, and fomer 
times alfo by varying the Paper, that is, infteed of a white Paper, holding 
a gray, ora black iece of PER rises Defic. 1 aol gueniiw lit 
Whence Lexperimemally Gouicl whae'k bid cbetisee imagitid, thapall 
ele two colours, namel 
_ the varieties of coloursimaginable are produc'd:from feveral degrees of 
> 
Yellow and. Bhie;.cr the mixture of them 
with light and darknef, that is; white and, black. And all:hofe alstott 
apis varieties which Limners and Painters: ate able to. make by come 
ve fomov d them toand froone by another, _ 
