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Hide scumming without using glaze?

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Hi everyone. I made a sculpture of terracotta and fired it to 04. There is scumming, so I tried to linseed oil it but it's still visible.  I want the natural clay color so, not interested in glaze, but is there something I can do to make the color uniform? I also tried scrubbing and sanding it but it's not budging lol. 

Please help ! Thank you, Linda 

Edited by Linda1313

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To remove the mineral salts deposit you could try a commercial efflorescence remover. It would likely  take a few applications and I would fire the linseed oil off first. Going forward if you get a terracotta that contains a tiny amount of barium the barium will prevent the mineral salts from scumming the clay. If your supplier doesn't have this information then I would contact the manufacturer and ask which of their terracotta bodies do contain barium.

Welcome to the forum!

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Thanks Min! 

Yes, I'm totally new here and  also very new to using this clay, firing, all of it lol. I am nervous about trying to glaze this piece and ruining it. Plus I like the light orange natural color.

Good to know I can still fire it with linseed!

I wonder if it's the poor quality water at my shop that's causing this when I spray it? I have no clue. But I will check about the barium. 

Thank you so much !

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