Royal Copenhagen Denmark Faience - small blue line marks on base

I am new to the Antiquers Forum.

I own several pieces of Royal Copenhagen Faience stoneware. I am familiar with Royal Copenhagen base marking system: crown; 3 wavy lines; dating system; artist mark; painters mark; etc. However, I recently noticed small (underglaze) blue lines on the bases of my pieces that I would like assistance to decipher. What do these blue lines mean?

Your feedback will be very much appreciated. Thank You.

See uploaded images below:
84A-2796: single horizontal blue line between DENMARK and Blue Waves
719-3207: blue lines, in shape of V, below Nils Thorsson artist mark
426-2841: short blue line above Aluminia mark
716-3104: two short parallel blue lines, looks like 11, below Nils Thorsson Artist mark
719-3207: two short blue lines, in shape of V, below Nils Thorsson Artist mark
719-2883: short crossed blue lines, looks like X, next to Royal Copenhagen Crown

 

Welcome JDUBB.

It's always helpful to show the whole piece too. Some members can better help you if they can see the whole picture, so to speak.

 

Potteryplease: Thank you for responding to my post. I honestly thought the base marking photos provided in my post would be adequate for experts in the forum to comment on the "blue line" question. Sadly this was not the case. My quest for understanding will continue... Thanks Again.

 

Well, I don't know the reason for the blue lines, but I would suspect some sort of production mark -- perhaps a mark made by the worker to show that he/she had done a particular part of the manufacture or design.