The way Minecraft forge supports transparent textures they are some set backs which can be corrected (yet), like:
- Spectral Doors can't be placed on any spectral blocks
- Spectral Torches can't be placed on the side of any spectral blocks
- If looking through a spectral block at another spectral block or glass they will not render making it look like the block isn't there.

TERMS AND CONDITIONS
0. USED TERMS
MOD - modification, plugin, a piece of software that interfaces with or alters the Minecraft software to extend, add, change or remove original capabilities.
MOJANG - Mojang AB
OWNER - Mark719, Current Maintainer of the MOD. Under the copyright terms accepted when purchasing Minecraft (http://www.minecraft.net/copyright.jsp) the OWNER has full rights over their MOD despite use of MOJANG code.
USER - End user of the mod, person installing the mod. (You!)

1. LIABILITY
THIS MOD IS PROVIDED 'AS IS' WITH NO WARRANTIES, IMPLIED OR OTHERWISE. THE OWNER OF THIS MOD TAKES NO RESPONSIBILITY FOR ANY DAMAGES INCURRED FROM THE USE OF THIS MOD. THIS MOD ALTERS FUNDAMENTAL PARTS OF THE MINECRAFT GAME. PARTS OF MINECRAFT MAY NOT WORK WITH THIS MOD INSTALLED. ALL DAMAGES CAUSED FROM THE USE OR MISUSE OF THIS MOD FALL ON THE USER.

2. USE
Use of this MOD to be installed, manually or automatically, is given to the USER without restriction.

3. REDISTRIBUTION
This MOD may only be distributed where uploaded, mirrored, or otherwise linked to by the OWNER solely. All mirrors of this mod must have advance written permission from the OWNER. ANY attempts to make money off of this MOD (selling, selling modified versions, adfly, sharecash, etc.) are STRICTLY FORBIDDEN, and the OWNER may claim damages or take other action to rectify the situation.

4. DERIVATIVE WORKS/MODIFICATION
This mod is provided freely and may be decompiled and modified for private use, either with a decompiler or a bytecode editor. Public distribution of modified versions of this MOD require advance written permission of the OWNER and may be subject to certain terms.

For permission to use this mod in a modpack you must meet the few steps below:

- The modpack may not be used to generate revenue of any kind.
- There must be credit and a link to this thread somewhere on the modpacks website or forum thread.
- If this isn't enough and you need personal permission from me, PM me and ask nicely and I will give you personal permission.