New Conga skin ?

Hello Conga Folks,
Last Friday afternoon I stretched my Vintage Schalloc, Made In Hamburg germany, Beech wood Congas with 1,8mm-2mm thick Steer hides. It's the first time I've skinned congas and am wondering if, after 3 full days, the Photos I've posted show that things are on the right track to curing properly to a light creme/white color as the person I baught them from assured me they would or not.
My doubts about this becoming the case are based on my inexperience with such thick and large skins as well as on the fact that the skins' surfaces are hard, rough and still brown in many places and feel dry to me. They look and feel in the middle especially the Tumba as they did before I soaked them; however the bearing edges are soft and white. I had the heat on in my studio over night and 24 hours later showed no marked change in color or texture.
Unfortunatley, the person I bought them from was extremely unhelpful over the phone and along with denying that he assured me they would have a creme or white finish even suggested that I sand them if the surface is rough and pretty much brushed me off. So, as you can imagine, having no experience with conga skins, I'm feeling lost in the sauce as we used to say and am afraid that something has gone wrong that can't be rectifeid. Any thoughtful and helpful as well as reassuring comments and suggestions are as usual greatly appreciated. Thanks!
Good vibrations,
Blavonski
Last Friday afternoon I stretched my Vintage Schalloc, Made In Hamburg germany, Beech wood Congas with 1,8mm-2mm thick Steer hides. It's the first time I've skinned congas and am wondering if, after 3 full days, the Photos I've posted show that things are on the right track to curing properly to a light creme/white color as the person I baught them from assured me they would or not.
My doubts about this becoming the case are based on my inexperience with such thick and large skins as well as on the fact that the skins' surfaces are hard, rough and still brown in many places and feel dry to me. They look and feel in the middle especially the Tumba as they did before I soaked them; however the bearing edges are soft and white. I had the heat on in my studio over night and 24 hours later showed no marked change in color or texture.
Unfortunatley, the person I bought them from was extremely unhelpful over the phone and along with denying that he assured me they would have a creme or white finish even suggested that I sand them if the surface is rough and pretty much brushed me off. So, as you can imagine, having no experience with conga skins, I'm feeling lost in the sauce as we used to say and am afraid that something has gone wrong that can't be rectifeid. Any thoughtful and helpful as well as reassuring comments and suggestions are as usual greatly appreciated. Thanks!
Good vibrations,
Blavonski