What could change my core aura from Blue to Green? My aura has always been blue and overnight it turned green

i think you are ridiculous.

The colors we like best are the ones that are the predominant colors i our aura. However, note that the colors in our aura shift as our mood shifts. No one has always-the-same moods, so no one has an aura that is always the same color. However, we DO have certain moods that we tend to make a habit of feeling ... and these are the predominant (seen the most often) colors in our aura. As for "spiritually advanced" beings, that is a form of spiritual egotism. The truth is that until we achieve enlightenment, NONE of us are "spiritually advanced". While there are degrees of enlightenment, anyone who has developed any advancement doesn't care about comparing or measuring how advanced they are. Therefore, even just the idea of "spiritually advanced" is actually a barrier to becoming such yourself. Yellow, btw is an indication of intellect and mental discrimination. White is the color those who have become enlightened. The "halo" you see represented in paintings, on statues. You do not achieve spiritual advancement by tapping into colors ... it works the other way around: becoming spiritually advanced has the result of producing these colors.

It is those new energy efficient light bulbs. Haven't you noticed how "yellow" they are? Turn everything blue into a green. Switch back to the old light bulbs.

Mold is growing on your aura.

the aura changes every second of the day

it is never one colour for any length of time

although it may have one colour more predominant than others

but if that has changed them something in your life may have changed significantly

maybe you have been ill or something

Green is the color of the heart chakra wich deals with love. Did you fall in love recently or find love for yourself? Blue is the color of the throat chakra which deals with self expression. Maybe your love energy is overiding your expression energy.

what is an aura? And how can you tell what it is.

Is this like some freaky thing that fortune tellers do?

LOL @ Khan's answer.

Maybe its too much yellow light. Avoid the sun at all costs.

how can you see ur aura?

i wanna see mine

Switch to tobacco.

illness/envy