Back in 1902, the Theosophist Leadbeater wrote Man Visible and Invisible which covers the bases. Here's a link to the text on-line which includes lots of colour plates but also I've copied in his interpretations of the colours below. There are lots of groups offering courses in astral projection and/or lucid dreaming in the UK. Do a Google. http://www.anandgholap.net/Man_Visible_And_Invisible-CWL.htm http://www.anandgholap.net/Man_Visible_And_Invisible-CWL.htm
134. Anger, for example, is represented by scarlet, and love by crimson and rose; but both anger and love are often deeply tinged with selfishness, and just so far as that is the case will the purity of their respective colors be dimmed by the hard brown-grey which is so characteristic of this vice. Or again, either of them may be mingled with pride, and that would instantly show itself by a tinge of deep orange. Many examples of such commingling, and of the resultant shades of color, will be seen as we continue our investigation; but our first endeavor must be to learn to read the meaning of the simpler hues. We will give here a list of some of these which are most common. 135. Black. - Thick black clouds in the astral body mark the presence of hatred and malice. When a person unhappily gives way to a fit of passionate anger, the terrible thought-forms of hate may generally be seen floating in his aura like coils of heavy, poisonous smoke. 136. Red. - Deep-red flashes, usually on a black ground, show anger; and this will be more or less tinged with brown as there is more or less of direct selfishness in the type of anger. What is sometimes called “noble indignation” on behalf of someone oppressed or injured may express itself in flashes of brilliant scarlet on the ordinary background of the aura. 137. Lurid, sanguinary red - a color which is quite unmistakable, though not easy to describe - indicates sensuality. 138. Brown. - Dull brown-red, almost rust-color, means avarice; and it usually arranges itself in parallel bars across the astral body, giving a very curious appearance. 139. Dull, hard brown-grey signifies selfishness, and is unfortunately one of the very commonest colors in the astral body. 140. Greenish-brown, lit up by deep red or scarlet flashes, denotes jealousy, and in the case of the ordinary man there is nearly always a good deal of this color present when he is what is called “in love”. 141. Grey. - Heavy leaden grey expresses deep depression, and where this is habitual its appearance is sometimes indescribably gloomy and saddening. This color also has the curious characteristic of arranging itself in parallel lines, as has that of avarice, and both give the impression that their unfortunate victim is imprisoned within a kind of astral cage. 142. Livid grey, a most hideous and frightful hue, betokens fear. 143. Crimson. - This color is the manifestation of love, and is often the most beautiful feature in the vehicles of the average man. Naturally it varies very greatly with the nature of the love. It may be dull, heavy, and deeply tinged with the brown of selfishness, if the so-called love occupies itself chiefly with the consideration of how much affection is received from somebody else, how much return it is getting for its investment. But if the love be of that kind that thinks never of itself at all, nor of what it receives, but only of how much it can give, and how entirely it can pour itself forth as a willing sacrifice for the sake of the loved one, then it will express itself in the most lovely rose-color; and when this rose-color is exceptionally brilliant and tinged with lilac, it proclaims the more spiritual love for humanity. The intermediate possibilities are countless; and the affection may of course be tinged in various other ways, as by pride or jealousy. 144. Orange. - This color is always significant of pride or ambition, and has almost as many variations as the last-mentioned, according to the nature of the pride or the ambition. It is not infrequently found in union with irritability. 145. Yellow. - This is a very good color, implying always the possession of intellectuality. Its shades vary, and it may be complicated by the admixture of various other hues. Generally speaking, it has a deeper and duller tint if the intellect is directed chiefly into lower channels, most especially if the objects are selfish; but it becomes brilliantly golden, and rises gradually to a beautiful clear and luminous lemon or primrose yellow, as it is addressed to higher and more unselfish objects. 146. Green. - No color has more varied signification than this, and it requires some study to interpret it correctly. Most of its manifestations indicate a kind of adaptability, at first evil and deceitful, but eventually good and sympathetic. 147. Grey-green, a peculiar shade which signifies deceit and cunning, will be found very prominently in the astral bodies of most primitives. It is by no means rare among civilized men, who ought long ago to have passed the stage of evolution which it indicates. As the man advances, this hue improves into a bright emerald-green, which still means versatility, ingenuity, and quickness of resource, but no longer implies any evil intent in connection with these qualities. It indicates the power of “being all things to all men”, not now for the purpose of tricking or misleading them, but at first in order to please them, to obtain their praise or their favor, and later on, as understanding develops, for the purpose of helping and strengthening them. Eventually it becomes a lovely pale, luminous blue-green, such as may sometimes be seen in an exceptionally delicate sunset sky, and then it shows some of the grandest qualities of human nature, the deepest sympathy and compassion, with the power of perfect adaptability which only they can give. In its earlier development a bright apple-green seems always to accompany strong vitality. 148. Blue. - Dark, clear blue usually betokens religious feeling, but this also varies according to the type of the feeling, its purity or bigotry, its selfishness or nobility. It is liable to be tinted by almost any of the qualities previously mentioned, so that we may have any shade from indigo on one side and rich deep violet on the other, down to a muddy grey-blue which is at the level of fetish-worship. The tinge of love or fear, of deceit or of pride, may mingle with the hue of religion, and thus there is a wide range of variation observable. 149. Light blue marks devotion to a noble spiritual ideal, and gradually rises to a luminous lilac-blue, which typifies the higher spirituality, and is usually accompanied by sparkling golden stars, representing elevated spiritual aspirations.
