Here's my idea for a new element and 2 new properties:

New property 1:  FILT can be melted into LAVA.  But, like HEAC, it only does so upon contact with LIGH.  Molten FILT has the same freezing point as molten GOLD.

New element:  Erbium (EBIM)

EBIM has the same heat conductivity, the same melting point, and all the same electrical properties as GOLD (for example; it can serve as an output for INST and allows SPRK to jump a 3-pixel gap, even through INSL, just like GOLD.)  EBIM also allows photons or BRAY to pass through.  It's optical properties are similar to that of FILT, but have have nothing to do with temperature or ctype.  It's tmp controls it's color and the color it dumps onto photons or BRAY, while it's tmp2 controls it's operator mode (it has the same operator modes as FILT.)  There are 8 possible tmp values:

1=red

2=orange

3=yellow

4=chartreuse

5=green

6=cyan

7=blue

8=violet

There are 4 possible tmp2 values:

1=AND

2=OR

3=SUB

4=XOR

Brush-spawned EBIM has no tmp value and thus does not change the color of photons or BRAY.  EBIM with no tmp value is the same color as ACID.  EBIM in "AND" mode (tmp2=1) acts as a semiconductor and does not conduct electricity to or from any EBIM of a different color (or tmp value.)  This makes it easier to make faster logic gates without the use of ARAY and FILT.  EBIM can be made by mixing molten GOLD and molten FILT (see above.)  All these properties are either the same as or similar to GOLD and FILT, but it has one property unique to it.  This property is explained below alongside another NEW property of a different element.

New property 2: CRAY will have a new mode; "replace" mode.  When CRAY is sparked by EBIM (see above,) it fills empty pixels with the element that matches it's ctype, like other CRAY modes.  But if a pixel is already occupied by an element, it will replace that element with the one that matches it's ctype.  This will make it easier to replace elements with other elements than you could using DRAY, because putting a line of particles in between will no longer be necessary.  But CRAY-spawned elements cannot inherit the CRAY's tmp and/or tmp2.  You need DRAY for that (set the the tmp and/or tmp2 of what you want the DRAY to copy.)  CRAY's new "replace" mode does not work on DMND.  DRAY will always be the only element that can destroy DMND or replace it with another element.