Suitcase Cake I Bought A Used Suitcase, And Underneath The Lining, There Is A Red Powder. What Is It?

I bought a used suitcase, and underneath the lining, there is a red powder. What is it? - suitcase cake

I bought a nice used Samsonite suitcase with a lining of blood. I decided to cut the food (because of the blood stain), and was surprised to find a layer of red dust from the inside. I sprayed some Clorox, the further tightening in the dust, turning into an unmanageable mud. Then I stopped to see Sister Act II Tonight I want to get back to this horrible project, but first, let me ask you: what is the dust and dangerous?