Color Tint after B&W Conversion

[BradSmith]

Maybe someone can explain.  Sometimes when I change the "treatment" of a color image to Black and White, I still have some color info in the histogram and visually.  I don't understand why.
thanks
Brad

[luxborealis]

Could it be that you have introduced colour to an Adjustment Brush or to a Graduated Filter. LR does not convert them to B&W as well.

[wolfnowl]

How are you converting from colour to B&W?  Using the B&W button in the basic panel, lowering the saturation, or using a preset?  With presets especially, it's important to check only those sliders you want to use with that preset or you can get unexpected overlays and results.

Mike.

[NikoJorj]

Or, perhaps, you have some Split toning...

[RikkFlohr]

Brad,

There are only three ways for color to remain after the change of Treatment to Black and White.

1. Split Toning
2. Adjustment brush with a color tint
3. Graduated filter with an adjustment tint.

If it is number 1, you can toggle off the Split Toning Panel to verify and cut the saturation to get rid of the tint.

If it is 2 or 3, select your brush pins, or gradient pins, until one shows a color in the color well. Double click that color and drive the Saturation to zero.  That way you can keep the effect of your local adjustment while losing the tint.

[BradSmith]

Thanks guys.  I always used the B&W conversion button on the basic panel, rather than a preset or reduced saturation.   I wasn't aware of any of those causes for post conversion color tints.  In my case, it turned out to be split toning. 
thanks again
Brad