According to ''Matthew'' ('Judaizer), the color ''white'' is related to the outside part of the tomb.
While in Mark the color white is found inside the Empty Tomb, for the dress of the young man.
I think that there is a link between the two passages:
http://gnosis.org/library/hyp_refut5.htm
So the color white is found inside the Jesus Tomb since the divine Christ is in the man Jesus.
I think that Matthew didn't like the idea found in Mark, since he:
1) converts the 'young man' in an angel
2) this angel comes from the heaven and enters in the tomb, against the presence of the young in Mark already inside the tomb,
3) the idea found in Mark was too much Gnostic for a judaizer à la Matthew.