Color Designation Red Brown Lookup

Bounded offline reference: RD, RB and BN are grading-service colour designations used for eligible copper issues. Source: PCGS/NGC copper colour designation guidance. RD means red, RB red-brown, BN brown; eligibility and percentage criteria vary by service and era, not automatically inferred from RGB pixels. Supported topic keys: summary, reference, limitations. No complete external corpus or live policy implied.

Description

Red and brown color designations describe service-specific copper surface categories.

Red and brown color designations describe service-specific copper surface categories.^[1]

This lookup explains the chosen topic using a bounded stored reference.

When to use Color Designation Red Brown Lookup

Use this tool to read a bounded explanation for an exact reference topic. Establish the coin issue, source edition, measurement basis and reference date where applicable.

How to use Color Designation Red Brown Lookup and understand its results

Establish the coin issue, source edition, measurement basis and reference date where applicable.
Enter topic, using the field meanings and rules below, then run the tool.
Read result. Inspect nested result fields where present, and review unknown records separately from known matches.
Correct any reported input issue and run again. Before using a successful result, check the stated units, signs, reference scope and observation coverage.

Input field	Meaning	Value type	Requirement
topic	Topic	string	Required

Choose one exact topic token from the table. The implementation looks up the stored value and returns it in the documented output field. Matching is case-sensitive; unrecognized tokens fail. This is an offline bounded reference, not a live catalogue or independent attribution.

Topic token	Stored value
summary	RD, RB and BN are grading-service colour designations used for eligible copper issues.
reference	PCGS/NGC copper colour designation guidance.
limitations	RD means red, RB red-brown, BN brown; eligibility and percentage criteria vary by service and era, not automatically inferred from RGB pixels.

value=referenceTable[exactToken]

Use the matching field units and the exact boundary, ordering and reference rules above.

Output field	Meaning	Value type
result	Calculated observation or qualified reference	object
result.text	text	string

json

{
  "input": {
    "topic": "summary"
  },
  "output": {
    "result": {
      "text": "RD, RB and BN are grading-service colour designations used for eligible copper issues."
    }
  }
}

Limitations and assumptions

Coin identification, reference applicability and measurement uncertainty require separate evidence. A returned explanation or arithmetic agreement does not establish authenticity, a certified grade or a current market value. RD means red, RB red-brown, BN brown; eligibility and percentage criteria vary by service and era, not automatically inferred from RGB pixels.

Missing required fields, unknown fields, wrong types and violated rules return input issues. Numeric values and outputs must be finite. Extremely large composite outputs are rejected.

Alternative or Complementary methods

For a related step, use Details Grade Damage Code Lookup: A details-grade code describes a condition issue under a particular service convention. For a complementary comparison, use Grade Description Lookup: Adjectival grade descriptions summarize visible condition at a broad collecting level.

References

Color Designation Red Brown Lookup — tool.io

Similar or alternative tools

Details Grade Damage Code Lookup
A details-grade code describes a condition issue under a particular service convention.
Grade Description Lookup
Adjectival grade descriptions summarize visible condition at a broad collecting level.