I chose Platinum gray by BM and custom halfed it to make it lighter. We have black metal accents on our roof and when the front of the house was painted, it looked lavender! Our paint guys said it was because there is one drop of marroon in the paint and maybe the reflection of the black roof is bringing out the purplish tone.....does anyone have a suggestion for a fabulous gray???? I had them mix the same color without the drop of marroon and it is too light. HELP!!!