The Wall of Color (GEP)

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As mentioned in the Border Ethereal chapter, the curtain of vaporous color is a shimmering wall of ethereal mist that leads to specific areas (adjoining planes) on the Border. The infinite areas of the waJI are the shoals and reefs of the Waveless Sea, and they languidly roll, ripple, and flap like world-sized banners-though a body can only see a small fraction of each area. There are as many areas on the Wall of Color as there are planes and demiplanes, and some bloods claim that the patterns, colors, and intensities of the curtain's luminescence indicate the exact plane (and even the exact area of the plane) that it leads to. (See "Taming the Ether: Proficiencies" on page 30.) 'Course, a body'd have to be plain barmy to bet his life upon a color. 
 Table 3: Color Curtain Index
Bordering Plane 	Color of Curtain
Prime Material 	Turquoise
Elemental Air 	Blue
Elemental Earth 	Brown
Elemental Fire 	Red
Elemental Water 	Green
Paraelemental Smoke 	Pearl
Paraelemental Ice 	Aquamarine
Paraelemental Ooze 	Chocolate
Paraelemental Magma 	Maroon
Quasielemental Lightning	Violet
Quasielemental Steam 	Ivory
Quasielemental Radiance 	Rainbow, shifting
Quasielemental Mineral 	Creamy pink
Quasielemental Vacuum 	Black with white specks
Quasielemental Salt 	Tan
Quasielemental Ash 	Dark gray
Quasielemental Dust 	Brownish gray
Positive Energy Plane 	Inviolate White
Negative Energy Plane 	Absolute Black
Demiplanes, various 	Metallic shades, various
Dread 	Unrecorded
Electromagnetism 	Copper
Imprisonment 	Unrecorded
Moil 	Black with purple swirls
Nightmares 	Swirling Gray
Shadow 	Silver
The Black Abyss 	Black with red whorls
The Boundless 	Translucent rose
The Semblance 	None (naked demiplane)
That Lives 	Flesh tones
Time 	Pearl and Silver
Wormscape 	Brown with writhing lines
The curtain of vaporous color is unique to the Deep Ethereal, and if a berk who thinks he's on the Border sees it, he's fooling himself about his location. Fact is, he's lost. Once he steps through a curtain, the traveler is on the Border Ethereal, but he can no longer see the curtain. On the positive side, this Deep Ethereal feature protects a body from the negative effects of a particular plane. As long as a cutter remains on the Deep side of a curtain, specific powers and effects on the Border, especially those caused by an adjoining plane, cannot affect him. Of course, a body on the Deep side of a curtain can't sense or affect anything on the Border, either. For additional commentary on the curtain of vaporous color, see the "Alternate Realities: Realms of Dreams and Powers" chapter.