chalk to write on the school blackboard. It is also known as gypsum and chalk (Mexico) or pastel it is a white clay that prepared in bars is used to write on the slates_站酷海洛_正版图片_视频_字体_音乐素材交易平台

chalk to write on the school blackboard. It is also known as gypsum and chalk (Mexico) or pastel it is a white clay that prepared in bars is used to write on the slates