Describir: 'Gläserne stoffe' Changierende stoffe

  ______   _    _     ______    _____                ___     _____    
 /_____// | || | ||  /_   _//  |  ___||   ____      / _ \\  |  __ \\  
 `____ `  | || | ||  `-| |,-   | ||__    |    \\   / //\ \\ | |  \ || 
 /___//   | \\_/ ||    | ||    | ||__    | [] ||  |  ___  ||| |__/ || 
 `__ `     \____//     |_||    |_____||  |  __//  |_||  |_|||_____//  
 /_//       `---`      `-`'    `-----`   |_|`-`   `-`   `-`  -----`   
 `-`                                     `-`                          
  _____   
 |  ___|| 
 | ||__   
 | ||__   
 |_____|| 
 `-----`