Green hair with Gelled flash

Ive had two chances recently to try to balance my flash with florescent lighting. I used a rosco plus green which balances daylight to florescent according to the packaging. The problem I am having is that I can get good natural skin and ambient color but everyone that has grey or blonde hair has their hair looking green. Here is an example.

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What shutter speed are you using? I've found that a full plus green adds a lot of green but doesn't lower the Speedlite's Kelvin temp down to match a typical cool white fluorescent tube.

I have just recently received my own set of Rosco gels - haven't yet had a chance to play with them.

Thought #1 - Could you add an additional Plusgreen to the setup?

Thought #2 - See this thread:
https://photography-on-the.net/forum/showthre​ad.php?t=460248

Mike, thanks for asking that as I thought I was at different settings and then never looked myself. I was at ISO 100 and 1/200th of a second. That probably killed 90% of the ambient. Maybe that part of his hair was the only ambient left?

I do have other shots though at 1/60th that have some green left here and there. Im thinking GJims post makes lots of sense though I dont htink my gel kit came with a 1/2 tough plusgreen.

GJim wrote in post #11902128
I have just recently received my own set of Rosco gels - haven't yet had a chance to play with them.

Thought #1 - Could you add an additional Plusgreen to the setup?

Thought #2 - See this thread:
https://photography-on-the.net/forum/showthre​ad.php?t=460248

I did my own test a while back and found that a Sun85 (3401) and a Plus Green (3304) combined to most closely match the 40w cool white tubes in my kitchen ceiling. That included whatever color shift is imparted by the plastic trim piece it shines though.

Keep in mind that there are really many different color temperatures depending upon the specific model of fluorescent tube. This has always been a pain in the a55. What you used to balance one was not the same as what you used to balance a different model of fluorescent tube...'cool white' tube, 'daylight' tube, 'kitchen and bath' tube, etc. all differed.

Your use of the Rosco filter was perhaps simply not optimized to match your tube, just as mike-d had to have Sun85 in the mix, to match his cool white tubes.

Also, your use of 1/200 put the fluorescent thru a partial cycle (assuming 60 Hz AC) and the tube could introduce off colors due to the departure from 1/15, 1/30, 1/60, 1/120

The hair shows up as yellow in PS. I reduced yellow saturation and luminance to get what looks like a true hair color.

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Whatever gel you add, you have to correct for it fully in your white balance settings or you'll be left with a colour cast. This shot looks like you used too strong a gel and then under corrected for it.

Wilt wrote in post #11903400
Also, your use of 1/200 put the fluorescent thru a partial cycle (assuming 60 Hz AC) and the tube could introduce off colors due to the departure from 1/15, 1/30, 1/60, 1/120

I think this is probably the key. And probably you only see it on that part of his hair because that's simply where ambient light was strongest. Next time you're in this situation take a frame with same settings but flash off. I'll bet you see the same pattern of illumination.

Another fun experiment is to put your camera on liveview under flourescent lighting. You can see it cycle through weird colors. The one you're having trouble with looks familiar to me from doing this in the past.

Fluorescent is tough.. I make a best guess after a few test shots and then just fix what comes up incorrectly in post, as drdiesel demonstrated.