Magic Jet Stain

On the label
“Magic” regd.
Jet Stain
for staining all kinds of leather jet black
Sole Makers: The Magic Polish Co. Ltd, Leicester, Eng.
Magic Jet Stain
Photo: David Pratt
The bottle when filled would have had a cork bung sealed with a dipping of black wax.
Magic jet stain
Alternative print style, presumed later than above example.
More about the Magic Polish Company here