In a solid contaminate test, how long should you wait for the oil drop to penetrate the blotter paper?

In a solid contaminant test, the recommended waiting time for the oil drop to penetrate the blotter paper is 5 to 10 minutes. This timeframe allows for a proper observation of the extent of penetration, providing a clearer indication of the contamination level in the oil. If the wait time is too short, you may not get a complete picture of how the oil interacts with the blotter paper, which could lead to incorrect interpretations of the results. Conversely, waiting too long may yield less relevant information due to potential drying or other changes in the oil or blotter paper. Therefore, the 5 to 10 minutes duration strikes a balance between thorough assessment and practical timing in the context of the test.