Hair color in infrared....

I figure yall could help me with this.

First of all this is about these images:

Just how much IR radiation do you expect to get from using flash? Flash tends toward the UV end of the spectrum & I would guess that it's not going to be much at all even before you filter it out by shooting under water. Ever notice that the light under water looks green? That's because the red isn't there anymore.

So, you need to use "hot lights" that produce some IR, or daylight. And, don't expect hair dye to act the same as shooting something with chlorophyll in it.
Test. See what you get. Modify your parameters & test again.

I am not sure what your question is. I did not see a question mark in your post to help me zero in on it.

The results will depend on the type of IR filter you have in your camera.

Flash will produce quite a lot of light in the part of the spectrum used in IR photography.

Hair dye does reflect IR quite a bit.

Physics is involved as it has lots to say about light.

Water is going to change things a lot (I am guessing about this and I would speculate that it will rapidly absorb the long wave lengths [the bits IR photography uses] since that is what it does in regular photography) so there is going to be the opportunity for you to experiment and get some surprises along the way.

Physics" is a catch all word that people fall back n when they can't or don't want to explain the actual science involved..

If your hair came out Blue during an IR exposure, it just meas that it was not holding a great deal of IR heat..
White = IR heat.. Because that is what you set your WB to with the "Grasss trick" the grass was hopefully loaded with IR radiation.

In your shots, the blue tone, is illustrating the cool, due to there not being a strong source of IR heat, (namely the Sun) involved.

There' is nothing wrong with your outcome,. and frankly, there is not a lot of "usual" results one can count on with IR. It's predictable to a point, but with lots of variation in the details.
There are several different filters in circulation, and no two white balance exactly alike.

it's what makes it fun!

Quad wrote in post #8385113
...

Hair dye does reflect IR quite a bit.

I only have a few IR images that include human ( or animal ) subjects, but in them, the hair is always much darker than the skin.. or even clothes.

In fact, Oddly, most IR images I have with hair, the hair color has remained exceedingly close to what we see under normal light.
Dark hair comes out dark, Auburn hair = Auburn, and Golden retriever fur, oddly Buff..

I like the colors in the shot.

CyberDyneSystems wrote in post #8385158
If your hair came out Blue during an IR exposure, it just meas that it was not holding a great deal of IR heat..
White = IR heat.. Because that is what you set your WB to with the "Grasss trick" the grass was hopefully loaded with IR radiation.

Odd cause its blue when I photograph myself outside too just a bit lighter more like the color of the hair that is closer to the light in these images.

CyberDyneSystems wrote in post #8385186
I only have a few IR images that include human ( or animal ) subjects, but in them, the hair is always much darker than the skin.. or even clothes.

In fact, Oddly, most IR images I have with hair, the hair color has remained exceedingly close to what we see under normal light.
Dark hair comes out dark, Auburn hair = Auburn, and Golden retriever fur, oddly Buff..

But not dyed hair. Most people do not dye their hair though so most will come about as you would expect. Dyed hair come out very white but not glowingly so. This is with sharp cut off filters though (87c).


These look like "color IR" filter or using channel swaping.

Ahh, even after reading it a few times I missed the importance of the word "dye" in your statement.

CyberDyneSystems wrote in post #8386184
Ahh, even after reading it a few times I missed the importance of the word "dye" in your statement.

Double Ahh

But now not "only" her hair dresser knows for sure.

Quad wrote in post #8385785
But not dyed hair. Most people do not dye their hair though so most will come about as you would expect. Dyed hair come out very white but not glowingly so.

That's not my experience. My friend Didi has dyed hair and it comes out in IR looking very similar to visible.

Quad wrote in post #8386296
Double Ahh

But now not "only" her hair dresser knows for sure.

lol idc. Everyone knows I like to dye my hair different shades of an un natural red color all the time. Its not like im some 40 year old woman covering up gray lol.

hollis_f wrote in post #8389429
That's not my experience. My friend Didi has dyed hair and it comes out in IR looking very similar to visible.

Is this film? If so then thats a totally diffrent thing. Also her hair looks dyed black anyway so i imagine that wouldn't change.

Quad wrote in post #8385785
But not dyed hair. Most people do not dye their hair though so most will come about as you would expect. Dyed hair come out very white but not glowingly so. This is with sharp cut off filters though (87c).


These look like "color IR" filter or using channel swaping.

No channel swapping. My camera is converted to infrared. The filter used in the conversion is equivalent to Hoya R72, Kodak Wratten 89b / 720nm.

Then I suggest that you shoot tests & take notes so you have some indication what you can expect with your camera, different filters, & the light source for a specific instance.