In Srimad Bhagavatam, 3.8.12 (page 353), translation it says, "He saw His transcendental body as bluish." Since it is capitalized H doesn't it mean Vishnu? In the purport it says, "Due to this polluted mentality and due to material sins, the aggregate combination of living entities appeared to be bluish." Isn't Vishnu bluish always?
Ans.
Yes, Vishnu is always bluish, transcendentally bluish. The purport indicates that the aggregate living entities appeared bluish, also. This material coloration was due to their fruitive activities (as in the state of ignorance, thus bluish).
Q.2
In SB 3.8.21, it says, "Thus, controlling all objectives, he concentrated his mind on the Supreme Lord." Does Brahma know about the Lord already or what does he meditate on?
Ans.
This particular passage is narrating the stage of Brahma's existence prior to realization of Krishna as the Supreme Personality of Godhead. He is meditating upon the mantra that was given to him, as we find in the Sri Brahma Samhita: the Gopal Gayatri Mantra. After meditating upon his mantra for 100 years, he realized Govinda in His fullness, as well he realized his own spiritual identity.