Foxing Spot Count Density Grader
Report actual foxing spot density on an explicit inspected area, not a universal quality grade. Caller independently verifies observations, reference edition, units and applicability; not a grading-service certificate, authentication, conservation treatment, actual market price or legal/insurance entitlement.
Description
Foxing spot density describes an observed count per measured surface area.
Foxing spot density describes an observed count per measured surface area.1
This grader returns that ratio without converting it to an issue-independent severity label or determining the origin of the spots.
When to use Foxing Spot Count Density Grader
Use this tool when you need to summarize the supplied collecting records or matched observations. Prepare independently verified observations, reference edition/context, and matching units or currency basis.
How to use Foxing Spot Count Density Grader and understand its results
- Prepare independently verified observations, reference edition/context, and matching units or currency basis.
- Enter spotCount, inspectedAreaCm2, following the field table and calculation rules below, then run the tool.
- Read spotsPerCm2. For result objects, inspect the nested output fields below, including any missing evidence or selected indices.
- Correct any input issues and run again. Before using a successful result, review its units, signs, evidence coverage, and stated model or reference assumptions.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| spotCount | Spot count | number | Required |
| inspectedAreaCm2 | Inspected area cm2 | number | Required |
Require a nonnegative safe-integer spot count and positive observed area in square millimetres. Divide count by area, retaining a continuous density and zero when no spots are counted.
spotsPerMm2=spotCount/areaMm2 Read these symbols with the field meanings and branch or reference rules above.
| Output field | Meaning | Value type |
|---|---|---|
| spotsPerCm2 | Spots per cm2 | number |
{
"input": {
"spotCount": 6,
"inspectedAreaCm2": 2
},
"output": {
"spotsPerCm2": 3
}
}Limitations and assumptions
Observations, reference edition, and applicability are independently supplied. Arithmetic and reference summaries do not provide authentication, a certified grade, or an actual market price.
Missing required fields, unknown fields, wrong types, and violated calculation rules return input issues. Numeric values must be finite; nonfinite numeric outputs are rejected.
Alternative or Complementary methods
For a related task, use Toned Spot Severity Area Percent Rater: Toning affects some portion of a stamp’s surface, but a ratio alone cannot establish its cause or a certified grade. This rater summarizes the measured toned area as a percentage of the supplied total stamp area. For a complementary step, use Face-Free Fault Composite Grade Adjuster: A composite grade adjustment can subtract supplied fault deductions from a base grade while respecting a chosen floor. This calculator exposes the raw score as well as the floored result so severe deductions remain visible.
References
-
Foxing Spot Count Density Grader — tool.io
Similar or alternative tools
- Toned Spot Severity Area Percent Rater
Toning affects some portion of a stamp’s surface, but a ratio alone cannot establish its cause or a certified grade. This rater summarizes the measured toned area as a percentage of the supplied total stamp area.
- Face-Free Fault Composite Grade Adjuster
A composite grade adjustment can subtract supplied fault deductions from a base grade while respecting a chosen floor. This calculator exposes the raw score as well as the floored result so severe deductions remain visible.