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Oil Code Thickness and Concentration Values
Bonn (BAOAC) Data
The following graphics help spill observers estimate the thickness and volume of oil on the water.
The Bonn* table, below, shows thickness and concentration ranges in metric and English units for each of the oil codes: S, sheen (silver/gray); R (rainbow); M (metallic); T, transitional dark (or true) color; and D, dark (or true) color.
| Code | Description | Layer-Thickness Interval | Concentration |
|---|
| microns (µm) | inches (in.) | m3 per Km2 | bbl/acre |
|---|
| S | Sheen (silver/gray) | 0.04 - 0.30 | 16. x 10-6 to
1.2 x 10 -5 | 0.04 - 0.30 | 1 x 10-3 to
7.8 x 10 -3 |
|---|
| R | Rainbow | 0.30 - 5.0 | 1.2 x 10 -5 to
2.0 x 10 -4 | 0.30 - 5.0 | 7.8 x 10 -3 to
1.28 x 10 -1 |
|---|
| M | Metallic | 5.0 - 50 | 2.0 x 10 -4 to
2.0 x 10 -3 | 5.0 - 50 | 1.28 x 10 -1 to
1.28 |
|---|
| T | Transitional Dark
(or True) Color | 50 - 200 | 2.0 x 10 -3 to
8 x 10 -3 | 50 - 200 | 1.28 - 5.1 |
|---|
| D | Dark (or True) Color | > 200 | > 8 x 10 -3 | > 200 | > 5.1 |
|---|
Chart modified by A. Allen from Bonn Agreement Oil Appearance Code (BAOAC) 02 May, 2006
Note the use of capital letters for thickness codes (S, R, M, T, & D). Use of these codes makes it easier to create and interpret sketches by aerial observers.
* The Bonn Agreement Oil Appearance Code (BAOAC), research conducted by Alun Lewis and SINTEF.
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Similarly, the chart below shows more visually the thickness and concentration values for each of the oil codes: silvery grey sheen (S), rainbow (R), metallic (M), transitional dark (T), and true dark (D).
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