This tendency coincides with the period when Hals was less popular among the wealthy .
Some historians have suggested that a reason for Hals ' predilection for black and white pigment was the low price of these colors as compared with the costly lakes and carmines .
This tendency coincides with the period when Hals was less popular among the wealthy , and some historians have suggested that a reason for his predilection for black and white pigment was the low price of these colors as compared with the costly lakes and carmines .