ThemeGTKCinnamon

Amber Theme

One theme architecture, five palettes. Phosphorus is the default and the reason the rest exist: amber on near-black, tuned against 1980s P3 phosphor monitors. The other four are not amber — they feed different primitives through the same pipeline, which is the point. Every colour in every profile derives from seven values, so a new look is a palette rather than a fork. One package,amber-theme, covers GTK 3, GTK 4, libadwaita, the Cinnamon shell, window borders and folder icons.

Profile	Accent	Background	What it is
`phosphorus`	`#f5a623`	`#080600`	The default: amber on near-black, the P3 homage.
`Amber-Light`	`#a05800`	`#fdf8ee`	The only light profile — dark amber on warm cream.
`Amber-Kat800`	`#e01515`	`#0e1014`	Red on near-black, with pale blue text.
`Amber-Katai`	`#7eb8d4`	`#3a3a3a`	Cool blue on mid grey, the least warm of the five.
`Amber-Mint`	`#4ec994`	`#0c1e18`	Mint green on a very dark green ground.

The phosphor look

Terminal — ~/agents

$kat800 new -s research

[kat800] session 'research' created

$ambrosia search "linux mint"

Found 4 results in history, 2 bookmarks

$▋

◉ PHOSPHORUS

Amber is not a colour choice so much as a compound: P3 phosphor, zinc-beryllium-orthosilicate with manganese, peaking near 585 nm. Why screens glowed that way, which monitors used it, and what the 1980s radiation scare actually changed is a story of its own — the phosphor glow.

Wallpaper collection

Ten original wallpapers for your Amber Linux desktop — all SVG, all scalable to any resolution, three of them built for the light theme rather than just glowing on black. These are the same ten theamber-theme package installs, so picking one from Cinnamon's Backgrounds panel and downloading it here get you the same file. Right-click any thumbnail to save, or use the download links below each.

Amber BannerThe leaf-in-amber mark beside the wordmark, off-centre left, with the tagline underneath↓ Download SVG

Amber MarkThe same mark centred and large — the leaf reads as mint green against the resin, which is the whole joke↓ Download SVG

Resin RainFalling resin drops, each one an inclusion holding a single code glyph↓ Download SVG

Fossil InclusionA polished amber cabochon holding a crane fly — growth rings, trapped air, a warm light pool beneath↓ Download SVG

Phosphor GridP3 amber phosphor dot matrix with scanline overlay↓ Download SVG

Amber SeamA geological cross-section — sleeping fossils in dark strata, one glowing amber vein running through the rock↓ Download SVG

Jurassic DuskWhere amber comes from — a resin-dripping trunk at dusk, one drop already closing over an insect↓ Download SVG

Specimen PlateBuilt for the light theme — a naturalist's plate, a sunlit fern inclusion, leader lines and a scale bar↓ Download SVG

Field NotesBuilt for the light theme — a P3 phosphor CRT in cross-section, annotated like an engineering sheet↓ Download SVG

Morning ResinBuilt for the light theme — translucent amber slices drifting through morning light, the calm one↓ Download SVG

All wallpapers are SVG — scale to any display resolution without quality loss. Works on 1080p, 4K, ultrawide, and HiDPI displays.

Colour palette

The palette is drawn from the characteristic glow of P3 amber phosphor (peak emission near #FFB800), tuned by eye against period photographs.

Phosphor 800#f5d060Primary text

Phosphor 600#c87000Accent / active

Phosphor 400#8a5000Muted / inactive

Screen Black#080600Background

Bezel#1a1600Surface / panel

Phosphor Glow#f5a62330Highlight / hover

Installation

Amber Theme ships through the same apt archive as the rest of Amber Linux — one package covering GTK 3, GTK 4, libadwaita, the Cinnamon shell, window borders and folder icon themes. Cinnamon Spices only accepts the Cinnamon-shell CSS slice of a theme, and a suite this size does not fit through that gap without shipping half a theme — so a real .deb through my own archive was the more honest path.

bash

# Add the Amber Linux apt archive
sudo curl -fsSL -o /usr/share/keyrings/amberlinux-archive-keyring.gpg \
  https://apt.amberlinux.org/amberlinux-archive-keyring.gpg

echo 'deb [arch=amd64 signed-by=/usr/share/keyrings/amberlinux-archive-keyring.gpg] https://apt.amberlinux.org amber main' \
  | sudo tee /etc/apt/sources.list.d/amberlinux.list

sudo apt update
sudo apt install amber-theme

# Activate the phosphorus profile
gsettings set org.cinnamon.desktop.interface gtk-theme 'phosphorus'
gsettings set org.cinnamon.theme name 'phosphorus'
gsettings set org.cinnamon.desktop.wm.preferences theme 'phosphorus'
gsettings set org.cinnamon.desktop.interface icon-theme 'phosphorus'

What is included

GTK 3, GTK 4 and libadwaita styling
Cinnamon desktop shell theme
Metacity / Muffin window decorations
Five profiles — phosphorus, Amber-Light, Amber-Kat800, Amber-Katai, Amber-Mint
Folder icon themes per profile, in both Mint-Y and Yaru folder shapes
A nine-colour Nemo folder palette, plus emblem folders for Code, Projects and .kat800
Ten SVG wallpapers, registered with the Cinnamon Backgrounds picker