Same block, same cracks, same processing — the only difference is the penetrant. How does side A (in-use) look next to side B (fresh reference)?
Disposition — what do you report?
Result
Your comparisons
Run
Situation
Truth
Your read
Disposition
Material Verification · Occasional Check
Is the penetrant itself still good?
The quench-cracked aluminum comparator is one block, cracked by heating and water-quenching, divided into two matched halves — A and B. Because both halves carry the same crack network, processing two penetrants side by side under identical conditions isolates one variable: the penetrant.
Apply the in-use penetrant to side A and fresh reference penetrant to side B.
Same dwell, same wash, same developer — then compare the two halves under UV-A.
This is an occasional check, done when penetrant condition is in question — not the daily TAM panel check.
There are two scenarios — run the comparison twice to see both a degraded tank and a healthy one.