Proceedings of Learned Societies. 
than one hundred weight, of the principle 
called by ihe French ate which abounds 
in oak-bark and many other vegetable sub- 
stances: the gold medal, or thirty 2miDeAas, 
Certificates of the supericr quality of the 
quantity so prepared, and asample of not 
less than 28lb. to be produced to the So- 
ciety onor before the last Tuesday in Janu- 
ary, 1810. 
65. InpELisce Ivx, To the Saas who 
shall discover to the Society a methed of 
making a black ink proper for writing, sa- 
perior to any at present known, ‘ndestructi- 
ble by chemical applications, and not dearer 
than that. which is now in common use; the 
silver medal, or fifteen guineas, 
Certificates that not less aa two gallons 
of such ink have been actually prepared, and 
found to possess the qnalities ly mention- 
‘ed, witha full detail of the process of making 
it, and two quarts of the ink, to be delivered 
to the Society on or bef fore the second ’ Tues- 
day in January, 1810. 
66. PREPARATION OF A NED STAIN FOR 
Corton Crotr. To 
communicate to the society the cheapest 
and most effectual method ef printing or 
staining cotion cloths wi 
an immediate application of the colouring 
matter to the cloth, equally beantiful and 
durable with the red colours now generally 
procured from decoctions of madder; the 
gold medal, or thirty guineas. 
Certificates that the above process has 
been advantageously used on ten pieces. of 
calico, each twenty-one yards or upwards in 
length ; one piece oi ihe calico 
quart of the colour in a liquid siate, atid.a 
fall account of he preparation and appiica- 
tion, tobe produced to the Society on or be- 
fere the second Tuesday in January, isto. 
67. PREPARATION CF A GREFN CoLouR 
FOP PAINTING coTTON CrotTa. To the per- 
son who svall communicate to the Society 
the best ani cheapest method of printing 
with a full green colour on cotton cloth, by 
an immediate application of the colouring 
matter from a wooden block to the cloth, 
equally beanfiful and durable as the colours 
now formed from the complicated process of 
the decoction .of weld on alumine, anc the 
solutions of indigo by earths or alkaline salts; 
the goid medal, or thirty guineas. 
Certificates aiid conditions as for pre- 
minm 64, 
65. RENDERING Musurn LESS COMBGS- 
‘tiete. To the persan who sbali discover to 
the Society a method of rendering muslin 
less combustible, to be effected by a cheaper 
and more effectual mode than any hitherto 
‘known ; the silver medal. 
Specimens of the muslin so prepared, with 
a full account of the process employed for 
the purpose, to be produced to the Society 
on or before the first Tuesday in February, 
1810. 
N, B, Iti is. eapeeted that the means em- 
ihe person waio, snail: 
i ared colour, by ~ 
so printed, a. - 
79 
ployed shall neither injure the quality of 
the muslin, stain it, nor damage any print 
or dye with which it may be Cetrcd 
69. SussTANcE FOR THE Basis or Paint, 
To the person who shall produce to the Sp- 
ciety the best substitute, superior to any hi- 
therto known, for the basis of paint, equally 
proper for the pu as the white-lead now 
employed; such substitute not to be of a 
noxious quality, and tobe afforded ata price 
not materially higher than tbat of white leads 
the goid medal, or one hundred guineas. 
A quantity of the substitute, not less than 
501b. weight, withan account of the process: 
used in preparing it, and certificates that at 
least one hundred w eight has been manufac- 
tured, to be produced to the Society on or 
Nene the first Tuesday in January, ISlQ. | 
70. Rep Pigment.» To the person who 
shall discover to the Society a full and satis-_ 
factory process for preparing ared pigment, 
fit for use in oil or water, equat intone and 
brilliancy to the best carmines and lak esnow 
known or in use,and periectty durable; the 
gold medal, -or thirty guineas. 
One pound weight of such colour, and a 
full disclosure of its preparation, to be pra- 
duced to the Society on or befere the first 
Tuesday in February, 18h. 
N. B. it is not required that the colour 
shonid resist the action of fire or: chemical 
applications, but remain anaitered by the | 
common: exposure to strong light, damps, 
and noxious vapours. ai 
71. Urveamavine, To the person wha 
shall prepare an artificial eltramarine, equal 
in colour, brilliancy, and durability, to the 
best prepared from japis lazuli, and which 
may be afforded at a cheap rate; the gold 
medal, or thirty guineas, 
The conditions are the same'as in the pre= 
ceding premium fer the red pigment. 
72. Buus Piewmenr rrom [ron “To the 
persen whoshall invent, and discover to the 
Society, the best blue pigment from iron, su-_ 
perior to Antwerp oer Prussian blue in colour 
and dt wurability, fit for use m_ oil or water, 
which may be afforded ata cheap rate ; ihe 
gold medal, or thirty guineas, . 
One pound weight of the colour, anda ful 
disclosure of its preparation, to be produced 
to the Society on or before the first ‘Tuesday 
in February, 1810. 
N. B. {t appears from the analysis of la~ 
pis lazuli by Klaproth, and the experiments 
of Gayton, (related in the Annales de Che- 
ntie) that ulframarine is a blue sniphurat of 
iron, and thata blue substance much res 
sembling it is constantly found amongst the 
scori@ of blast furnaces where iron is re- 
duced, the Society by offering the above pre- 
minum “wish to call the attention of persons 
to these facts, and encourage them to make 
experiments, in the hope of producing a blue 
pigment which may be substituted for ultra~ 
m2 ay 
5. Destructive Errects rrom Morus. 
