Sorry to put anyone off this, but the horns of our own cattle are not allowed to be sold. All those beautiful Highland cattle horns are incinerated, despite the fact that the animals are well cared for, healthy and disease free.
Instead horns are imported from India, Africa, etc......and called 'organic'. Make blooming sure you not only scour them, but bleach them, and for heavens sake be careful with the dust until you do so.
Thanks for all your advice . Will try using the different methods and let you know how it turns out.