Hard ice, with less air in it, is more blue in color. At times it may appear clear like glass. When an ice slope is between 50deg. It is possible to ascend steep ice with only one tool but keep in mind that it is usually faster, safer and more secure to climb with a second tool. Because ice climbing is so tool-dependent, it is necessary to consider your equipment needs carefully.
Boots are where it all begins.
Well fitted, rigid soled mountaineering boots give you minimal heal lift and provide the performance needed for steep ice. Ice tool preferences vary greatly. As with so many aspects of climbing, the type of tools tends to be a matter of personal preference. I have had the best luck on steep ice with recurve or straight droop picks. I use one tool with an adze and one with a hammer.