green
Let an agent specify green precisely and handle its conventional meanings in safety and signalling, and its accessibility issues.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
Let an agent specify green precisely and handle its conventional meanings in safety and signalling, and its accessibility issues.
The colour between yellow and cyan in the visible spectrum, around 495-570 nm, perceived as the colour of fresh foliage, with many shades from celadon to Brunswick green.
What it is for: Signalling safety, go and permission, and expressing nature and other meanings in design and culture.
It can be specify it, in a colour space; use it in signals, under safety conventions; produce it, with pigments or light; check it for colour-blind users.
Distinguishing features
A hue between yellow and cyan
Safety colour for safe condition and first aid
Confused with red by people with red-green deficiency
Meanings differ across cultures
What it looks like
The hue of leaves and grass; shades range from yellow-green to blue-green.
Physical character
dominant wavelength: 495-570 nm
How it is recognised
Hue angle around 90-150 degrees in HSL
Named shades: emerald, celadon, Brunswick green, aquamarine at the edge
Codes such as sRGB #00FF00 or safety green RAL 6032
Related models
is a kind of - hue
is used in - safe condition
is confused with - for colour-blind people
is produced by - green pigments
In practice
Families and kinds
shades: emerald, olive, celadon, Brunswick green
pigments: chromium oxide, phthalo green, historical copper greens
safety green in ISO 3864
Identifiers
RAL code 6000 series industrial greens
Standards and regulation
ISO 3864 safety colours
CIE signal colour specifications
WCAG
Failure modes and hazards
Red-green confusion
Toxic historical pigments such as Scheele green
Poor contrast
Also called
+53
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.green
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Specification Which green.
Green covers many shades.
Value
Colour values.
Value
Exact value.
- Which exact green is meant, in which colour space? measurement
- Which named shade is closest? definition
Standard
Safety green.
Standard
Standardised greens.
- Does a standard fix the value here? provenance
- What tolerance is allowed? measurement
Signalling Green as a signal.
Green means safe or go in many systems.
Meaning
Safety meaning.
Meaning
Meaning in context.
- What does green mean in this safety context? definition
- Is shape or text also used? boundary
Signals
Traffic and status lights.
Signal spec
Signal specification.
- Does the signal green meet its specification? measurement
- Is it distinguishable from red for colour-blind users? boundary
Accessibility Seeing green.
Green and red confusion affects many people.
Colour vision deficiency
Deutan.
Check
How it appears.
- How does it appear to people with deuteranopia? measurement
- What redundant cue exists? action
Contrast
Ratios.
Contrast
Contrast ratio.
- What is the contrast ratio with its background? measurement
- Does it meet WCAG? boundary
Materials and culture Making green and meaning.
Some greens were poisonous; meanings vary.
Pigments
Sources.
Pigment
Pigment used.
- Which pigment makes this green? definition
- Is it toxic, as historical arsenic greens were? boundary
Culture
Meanings.
Meaning
Cultural meanings.
- What does green signify in the target culture? definition
- Is it tied to a political or religious meaning? boundary
What the second pass must settle
- Which reference green should the registry use?
- How should cultural meanings be recorded?
- The registry entry has a merged alias about body discharge; should it be removed?