Franck Ribery and Florent Malouda scored as France beat Serbia 2-0 on Thursday to extend its unbeaten run to 20 matches.
The performance was an improvement on Sunday's 3-2 win against Iceland, where France had to come back from 2-0 down to scrape a late win.
This time, France went into the break two goals ahead as Ribery scored with a clinical finish and then Malouda fired an unstoppable shot into the top corner from 30 meters out.
But there was some cause for concern for Blanc as defensive midfielder Yann M'Vila limped off early on with an ankle injury after receiving a heavy tackle from behind.
France plays Estonia in its final friendly next week before starting the European Championship against England on June 11.
Blanc will have been encouraged by his team's performance, particularly in the first half, where France could have scored five goals.
The passing and movement, if not some of the wasteful finishing, were the best France has shown for a long time, with forward Karim Benzema combining well with Ribery and Samir Nasri, and with Malouda thriving in his new role from the left side of a flat, three-man midfield.
Ribery and Malouda were both worried about their form heading into Euro 2012, but did much to push their claims for a starting spot against England, as did left back Gael Clichy and center half Laurent Koscielny, who both played well.
But M'Vila's injury may dampen Blanc's spirits.
He went off after only five minutes after being fouled by Dusan Tadic.
M'Vila went down clutching his right leg, but got back up and continued playing. Moments later, however, the midfielder made one pass with his left foot and then fell down again. He was replaced by Alou Diarra.
France took the lead in the 11th minute and added a second goal five minutes later.
Clichy helped set up the first as he burst down the left and hit a hard cross that goalie Zeljko Brkic could only punch away. The ball fell to Ribery just inside the penalty area and he thumped it into the roof of the net.
Ribery's poor form for France over the past couple of years had been a talking point, and even Blanc admitted he was running out of patience as he waited for the Bayern Munich winger to reproduce his club form for France.
But after more than three years without an international goal, Ribery has two in his last two games after also scoring against Iceland.
Malouda gave Brkic no chance moments later, collecting the ball, taking a step forward and planting an unstoppable shot into the top left corner.
France goalie Hugo Lloris had nothing to do until the 25th, and that was only to smother a tame shot. France broke straight back up the other end, and Samir Nasri went close with a low shot across goal.
Serbia's defense was breached again in the 29th but Ribery's cut back fell just behind Benzema, with the goal gaping.
Serbia started the second half better and defender Branislav Ivanovic forced Lloris into a fingertip save with a stinging free kick. Lloris then dived to his left to keep out Tadic's low strike.
The match petered out as France was happy to stroke the ball around and Blanc made a few substitutions.
