Paint Technology and Tests

by Henry A. Gardner

[23] This pigment on analysis proved to be zinc lead.

TESTS INAUGURATED IN 1909
RESULTS OF INSPECTION OF PITTSBURG TEST FENCE, MAY, 1910

FORMULAS													REPORT OF INSPECTION				Pa- nel Num- ber
For- mu- la Num- ber	Basic Car- bonate White Lead	Zinc Oxide	Basic Sul- phate White Lead	Preci- pitated White Lead	Zinc Lead	Litho- pone	INERT PIGMENT
							Cal- cium Car- bonate	Silica	Asbes- tine	China Clay	Bary- tes	Blanc Fixe
													CHALKING	CHECKING	GENERAL CONDITION	REMARKS
	%	%	%	%	%	%	%	%	%	%	%	%
1	—	—	45	—	—	40	15	—	—	—	—	—	Considerable	Slight	Fair	Dark in places. Diffused	1
2	—	—	45	—	—	40	—	15	—	—	—	—	Slight	Bad	Fair	Dark in places	2
3	—	45	—	—	—	45	10	—	—	—	—	—	Medium	None	Good	Darkening shown in places	3
4	—	—	45	—	—	45	10	—	—	—	—	—	Considerable	None	Good	Medium dark	4
5	—	40	—	—	—	40	20	—	—	—	—	—	Slight	None	Good	No excessive darkness	5
6	—	—	45	—	—	35	—	—	20	—	—	—	Medium	Slight	Good	Surface fairly white	6
7	50	—	—	—	36	—	—	—	2	8	4	—	Medium	None	Excellent	Whitest surface of new tests	7
8	—	—	50	—	—	36	—	—	2	8	4	—	Extremely bad	Slight	Fair	Surface darkening	8
9	—	—	50	—	—	36	—	—	2	—	12	—	Extremely bad	Slight	Fair	Not as bad as No. 8	9
10	—	36	50	—	—	—	—	—	2	8	4	—	Slight	None	Good	Excellent surface; very white	10
11	28	55	—	—	—	—	—	—	3	—	7	7	Slight	None	Excellent	Surface fairly white; thin soot	11
12	—	55	28	—	—	—	—	—	3	—	7	7	Medium	None	Good	Surface white	12
13	—	60	—	—	—	30	10	—	—	—	—	—	Medium	Very bad in spots	Fair	Slight darkening	13
14	—	30	30	—	—	30	10	—	—	—	—	—	Heavy	Considerable	Fair	Slight darkening	14
15	—	—	60	—	—	30	—	—	10	—	—	—	Extremely bad	Slight	Fair	Fairly white	15
16	—	—	—	—	—	100	—	—	—	—	—	—	Extremely bad	Advanced and deep	Bad	Surface rough with considerable disintegration and much darkness	16
17	—	—	—	—	—	100	—	—	—	—	—	—	Not as bad as No. 16	Less advanced than No. 16	Fair	Not as dark as No. 16; slightly mottled in places; buff color	17
18	33	33	—	—	—	—	—	17	—	17	—	—	Very slight	Practically none	Fair	Surface white	18
19	34	33	—	—	—	—	—	33	—	—	—	—	Very slight	None	Good	Surface fairly white	19
20	34	33	—	—	—	—	—	—	—	33	—	—	None	None	Good	Surface fairly white	20
21	100	—	—	—	—	—	—	—	—	—	—	—	Slight	Slight	Fair	Surface very rough and dark	21
22	[24]100	—	—	—	—	—	—	—	—	—	—	—	Medium	Slight	Fair	Surface fairly white	22
23	100	—	—	—	—	—	—	—	—	—	—	—	Slight	Bad	Fair	Surface rough and darkest on fence	23
24	—	—	100	—	—	—	—	—	—	—	—	—	Bad	None	Good	Surface white	24
25	—	—	—	—	100	—	—	—	—	—	—	—	Slight	None	Good	Fairly white surface	25
26	—	—	—	100	—	—	—	—	—	—	—	—	Medium	Slight	Fair	Rough and very dark; chalking is disrupting black coating	26
27	100	—	—	—	—	—	—	—	—	—	—	—	Medium	Slight	Good	Surface fairly white	27
28	100	—	—	—	—	—	—	—	—	—	—	—	Medium	Deep; evident without glass	Poor	Surface rough and very dark	28
29	24	45	13	—	—	—	—	—	18	—	—	—	Slight	Slight	Good	Very white surface	29
30	45	—	—	—	—	40	15	—	—	—	—	—	None	Slight	Fair	Color dark	30
31	45	—	—	—	—	40	—	15	—	—	—	—	Very slight	Advanced	Fair	Color very dark	31
32	45	—	—	—	—	35	—	—	20	—	—	—	Extremely slight	Considerable	Fair	Color very dark; rough surface	32
33	50	—	—	—	—	36	—	—	2	—	12	—	Extremely slight	Slight	Fair	Surface dark and rough	33
34	75	—	25	—	—	—	—	—	—	—	—	—	Slight	Deep	Fair	Surface medium dark	34
35	50	—	50	—	—	—	—	—	—	—	—	—	Considerable	Slight	Fair	Surface medium dark	35
36	—	—	—	—	—	—	—	100	—	—	—	—	Extremely bad	None	Fair	Vehicle disintegrated, leaving very white, chalked surface of pigment	36

[24] This pigment on analysis proved to be zinc lead.

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CHAPTER XII

NORTH DAKOTA PAINT TESTS