SIGNATURES and MARKINGS

Lo and behold, but...

According to Merriam Webster definition of Lo and behold:

            -- Used to express wonder and surprise --

Keep in mind that even in medieval times there was already substantial copying and image theft from high paid artists. The use of hidden and/or obscured markings was primarily to prove the authenticity of the art in question.

However there is a whole world related to "signatures".
For a long story short click HERE.

Through discovery and analysis, it became clear that there are more hidden signatures than expected. Below are some hidden marks (signatures?) from Hans Holbein Jr.



He also hid his “hallmark” H and variations thereof in his many artworks:

Click Image or HERE for a sample comparison of
Hans Holbein the Younger signatures.

Using some visual enhancements, the H has the same style and structure as in his ‘Magdalena (Kunstmuseum Basel / Inv. 1913.216)’ as in his ‘Seated Virgin and Child (Museum der bildenden Künste, Leipzig)’

Is there a marking or signature on Katrain?