Qbfervations in Electricity. 395 
of every eie&ric fliock that can be given. II. No one 
colour feems preferable to the others, if they be equal 
in fubftance, and equally well mixed with oil; but a 
thick coating does certainly afford a better defence than a 
thinner one. 
By rubbing the above mentioned pieces of paper, I find 
that the paper painted with lamp-black and oil is more 
eafily excited, and acquires a ftronger eleilricitv than the 
papers painted with the other colours ; and perhaps on 
this account it may be, that lamp-black and oil might 
refill the fhock fomewhat better than the other paints. 
It is remarkable, that vermillion receives the black 
impreffion, when painted with oil, nearly as well as 
when painted with water. The paper painted with white 
lead and oil receives alfo a black mark, but its nature is 
very particular. The track, when firft made, is almofl 
as dark as that marked on white lead painted with wa- 
ter; but it gradually lofes its blacknefs, and in about two 
hours after it appears without any darknefs, and when 
the painted paper is laid in a proper light appears only 
marked with a colourlefs track, as if made by a finger- 
nail. 
F f f 2 
