The phrase "amount of grey" is correct and usable in written English.
It can be used when discussing the quantity or degree of grey color in various contexts, such as art, design, or even metaphorically to describe ambiguity.
Example: "The painting had an impressive amount of grey, which added depth and complexity to the overall composition."
Alternatives: "degree of grey" or "level of grey".
With Napster there was an enormous amount of grey".
"The amount of grey money sloshing around at the moment is all about politics".
Specifically, the amount of grey matter in the orbitofrontal cortex was reduced in people with cocaine addiction, an area involved in decision-making and goal-directed behaviour.
Jonathan Walters (@Jon_Walters_) Before I start Yes penalty record isn't the best,Yes I scored 2 own goals missed a pen and managed to kick the ball in my own face... October 24, 2013 Jonathan Walters (@Jon_Walters_)...all in the same game and Yes I have a large amount of grey hair so don't bore me telling me all this.
Jonny Bairstow looks about 10 years younger, but I look no different because I still have the same amount of grey hair - or so people keep telling me.
The Pittsburgh team also had access to brain scan results from four years previously which measured the amount of "grey matter" in their brains.
During the session, one of the studies that was mentioned was one reporting lower amounts of grey matter in males that consume more hours of porn per week.
Each autopsy sample consisted of 300 mg to 500 mg of prefrontal cortex tissue with similar amounts of grey and white matter in each sample.
The total amounts of grey matter did not significantly differ between groups (means ± S.D.: SLI 749 ± 100 cm; SIB 726 ± 76 cm; TYP 738 ± 80 cm).
As all samples were dissected to contain similar amounts of grey (majority) and white matter (trace), it is unlikely that the results could be a simple reflection of increased white matter density in the adolescent samples.
A Japanese study from Tohoku University that included 276 children, did MRI brain scans and showed that children who spent the most hours in front of the TV had greater amounts of grey matter in regions around the frontoparietal cortex.
